#byakugou
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primnroses · 5 months ago
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— An insight about summons: Katsuyu, the slug of the Shikkotsu Forest
The information presented in this post has been checked and revised. My aim is not to hate or to discredit any of the characters mentioned. Please read about me for further information.
This post will contain evidence in picture format directly from the manga Naruto (1999 - 2014) created by Masashi Kishimoto and published by Shueisha in 1999. I will also use information from the official databooks of Naruto.
This informative post will analyze the concept of animal summons in the world of Naruto and highlight Katsuyu’s unique abilities throughout the series providing evidence. This meta will also mention other animal summons from the Three-Way Deadlock. I will not use information present in the novels because there is none.
This meta is crossposted in AO3.
I give my permission to use or share this thread with informative purposes as long as you credit me.
I do not support the anime or the work of Studio Pierrot in regards to Naruto because I consider it over exaggerated and beyond biased. Furthermore, these fillers include some actions that these characters are unable to do in the canon according to official sources and they also generate unnecessary debate.
Please, take this into consideration.
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Katsuyu, also known as Katsuyu of the Shikkotsu Forest, is a giant slug from the Shikkotsu Forest, a secret and legendary place from the Three Unexplored Sage Regions (仙人三大秘境, Sennin Sandai Hikyō). 
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The Three Sage Unexplored Regions according to the Fourth databook.
She is the personal summon of the Fifth Hokage Tsunade, and later, her disciple Sakura Haruno; both women are probably the only people in the world that have been able to summon the slug.
Katsuyu possesses one of the most unique qualities and abilities among animal summons, most of which are still a mystery within the series. 
— WHAT IS A SUMMON AND ANIMAL SUMMONS?
A summon is the ability to invoke objects, weapons, people or animals. This action is carried out through a Summoning Technique (口寄せの術­, Kuchiyose no Jutsu), a special hand seal based jutsu to transport any element to the user’s location for a limited amount of time. 
A Summoning Technique is classified as a space-time ninjutsu and a C-Rank (chūnin level) difficulty jutsu. 
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Summoning Technique according to the First databook.
Usually, in order to summon objects or weapons, users apply scrolls or special sealing techniques to contain the desired material. This is the case of Tenten, for example; she uses scrolls to seal multiple kunai, shuriken and any weapon of her choice, granting her the title of “Master of space-time ninjutsu”.
However, for animals and living creatures, this is different.
An animal summon is a technique that adds to the ninja’s ninjutsu repertoire, as a shinobi can take advantage of the animal’s abilities for battle or other purposes.
Before any animal can be summoned, the animal and the user must sign a contract with the species or the specific creature using their blood. In order to summon said animal, the user applies some of their blood, normally by biting their fingers, and channels their chakra to their hands thus invoking a sealing pattern that transports their summon to that same location. The amount of chakra used to summon the creatures determines the size and number of summons. 
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The summoning contract of the Toads of Mount Myōboku, Naruto chapter 92.
In the case of the Three Unexplored Sage Regions, the summoning contracts vary. 
Naruto Uzumaki Jiraiya and Minato Namikaze sealed a contract with the toads of Mount Myōboku using their own blood, so when they perform a Summoning Technique, any available toad can offer their services to them. 
Orochimaru has his contract with the snakes of the Ryūchi Cave tattooed on his arms. The methods his disciple Sasuke Uchiha uses to summon snakes from the same location is unknown. 
Tsunade and Sakura Haruno do not have a physical contract, or at least it has never been revealed. However, by reading the manga, the contract with the Shikkotsu Forest might be through their Strength of a Hundred Seal, as it is only possible to summon Katsuyu if the summoner possesses this seal.
It is unknown if there is a blood contract involved, but it is likely that there is since the method of summoning is blood like his companions. 
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Orochimaru's contract Naruto chapters 165 and 344.
— KATSUYU AND HER ABILITIES, WHAT MAKES HER SPECIAL?
Katsuyu is a very intriguing and interesting animal and the only one whose past has never been explored.
Summon’s habitats and the Three Unexplored Sage Regions are home to a single species of animals. 
The Ryūchi Cave is home to snakes such as the White Snake, Manda or Aoda, and Mount Myōboku is home to toads like Gamakichi, Gamamaru or Gamabunta.
But, unlike those, Katsuyu is the only organism living in the Shikkotsu Forest. She does not have any other slug companions. 
Following the same scheme as the rest of summons, Katsuyu resembles a real slug. 
She is white or ivory in color, with three turquoise stripes running on her head and sides that start on her head and end in her tail. 
One special feature about her appearance is that her true size has never been seen. Using one summoner, Katsuyu is bigger than the Hokage Residence, and using two summoners, Katsuyu is the size of the roots of the God Tree, which is just one tenth of her real size according to Tsunade. 
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Katsuyu's size summoned by one person or two, Naruto chapters 422 and 650.
Her size changes depending on the amount of chakra used to summon her. She can appear as a small slug used to gather intel or help in supplementary tasks, or she can appear as a giant creature using one or two summoners. 
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Small Katsuyu summoned to assist Headquarters Naruto chapter 561.
Her age is a true mystery. It is known that toads and snakes live many years and have descendants, such as Gamabunta and Gamakichi’s father and son relationship, or Aoda having great grandchildren; or certain summons retiring when they reach an age while their companions or children replace them. 
The Three Unexplored Sage Regions are legendary places known for many generations. 
Katsuyu, on the other hand, is the only inhabitant of the Shikkotsu Forest. She does not have descendants or companions in her home habitat. Her age or her true origins are a mystery. The first shinobi to discover her existence or previous masters before Sakura Haruno and Tsunade are also unknown.
The first and most important thing to point out is that Katsuyu can only be summoned by users of the Strength of a Hundred Seal. This seal is an extremely difficult jutsu to learn and achieve, so there have only been two summoners in history.
The reason for this is that Katsuyu is such an enormous animal that it requires an immense amount of chakra to summon, and that chakra is stored inside the seal. 
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Tsunade and her disciple Sakura Haruno are the only beings able to summon Katsuyu Naruto chapter 650.
The primary skill Katsuyu has is the ability to divide herself in many fragments, hundreds or thousands of them in fact. This technique is called Slug Great Division (蛞蝓大分裂­, Katsuyu Daibunretsu) and it can be used for supplementary purposes, as well for battle. 
In a fight, thanks to her rapid ability to transform her body and divide herself, she can separate herself to nullify attacks by avoiding any strike at incredible speeds. She can do this as many times as she wants without exhaustion. Each of these fragments are also quite fast, able to throw themselves in front of people to shield them from danger.
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Manda trapping Katsuyu but she escapes Naruto chapter 170 and Second databook.
She also has the ability to spit a sticky and elastic acid, a jutsu called Tongue Tooth Sticky Acid able to melt stones and vaporize everything it touches (probably senjutsu although never truly revealed). It is also very difficult to dodge due to its unpredictable nature. 
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Slug acid, Naruto chapter 170 and Second databook.
Unlike Shadow Clones or other regular clones that are independent from each other and are not interconnected, what Katsuyu does is divide her own body in equal parts, so she is in as many places as she wants at once. She is one entity divided into many other independent and interconnected parts while remaining one single body. Each of her divisions behaves like their own person, so she can complete different tasks while also knowing what her other parts are doing in other places.
Being the summon of medical ninjas, Sakura Haruno and Tsunade take advantage of Katsuyu’s ability to divide herself in order to channel their healing chakra and treat as many people as necessary. 
With a technique called Immense Network Healing (蛞蝓・網療治夥­, Katsuyu: Mōryōjika), Katsuyu collects chakra from the Strength of a Hundred Seal to transform it into healing chakra and treat the injured. 
Using the Great Division and Immense Network Healing in tandem, Katsuyu has the ability to heal and protect everyone she makes contact with. Healing any kind of injury or absorbing people inside her in order to shield them from attacks or sudden explosions is her specialty. Her body is able to resist explosions and even Kurama's corrosive chakra.
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Katsuyu divides her body and heals the Alliance Naruto chapter 634 and Fourth databook.
In fact, Katsuyu's power is not only limited to healing wounds, but regeneration too. One of her most impressive feats is the ability to maintain a patient in suspended animation, keeping them alive for as long as she possesses chakra from the seal in order to ensure their survival. 
Katsuyu was able to keep Tsunade alive despite having her body bisected, which on normal circumstances, would mean instant death. However, the slug's regenerative abilities allowed Tsunade to remain alive until she obtained a chakra boost from a third party. This fact is known as Tsunade does not really present the unique Uzumaki Clan ability to keep themselves alive for as long as possible.
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Katsuyu kept Tsunade alive despite having her body cut in half, an impressive feat Naruto chapter 635.
This jutsu also acts as a sensing technique due to Katsuyu being connected to the chakra of the injured in order to heal them and her master. Katsuyu is able to relay Kakashi Hatake and Chōza Akimichi’s conditions to Tsunade through their connection, as the slug is connected to the Strength of a Hundred Seal; as well as being able to tell Sakura that Kurama’s chakra was still connected to the Allied Shinobi Forces.
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Katsuyu can transmit the chakra levels and the condition of everyone she is in contact with Naruto chapter 427.
This way, Katsuyu was able to protect Konoha’s citizens from Pain’s Shinra Tensei and even survive Kurama’s toxic chakra. 
Able to be in many places at once, her ability to cover infinite distances while her parts remain interconnected allows her to fulfill communication and intel gathering roles. Being in many places and her clones being part of the same body, Katsuyu relays information to one person or multiple people, something she could do by attaching herself to someone’s shoulder and speaking. 
It was Katsuyu the one giving Naruto Uzumaki information about Pain and also told him that Nagato had revived Konoha citizens through the clones that stayed in the village, kept every villager informed about the situation and followed evacuation protocols when Naruto transformed into six tails, and told Tsunade everything that was happening in the battlefield thanks to having another body summoned by Sakura on the other side of the country, and vice versa.
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Sakura instructing Katsuyu to evacuate the area through the multiple clones Naruto chapter 438.
This communication ability can cover immense ground at once because the communication is instant. It works similar to regular telepathy, but instead of hearing the other person's voice in their head, people are talking to Katsuyu, and Katsuyu in turn is actually talking to herself through her clones.
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Katsuyu's clones on different parts of the Land of Lightning tell Tsunade and Sakura the events that have taken place on both ends Naruto chapters 635 and 647.
An animal summon can only perform at the top of their abilities for a limited amount of time, what is known as the summoning time limit. 
It is unknown exactly how long the invocation lasts, or whether it varies between animals. A summon will help its master before the jutsu runs out or the summon has exhausted its power. 
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Gamakichi mentions the summoning time limit Naruto chapter 642.
However, for Katsuyu, this is not the case. 
The slug can be summoned for unlimited periods of time and several times a day, as seen when Katsuyu spent the Fourth Shinobi World War by Tsunade’s side in the Headquarters, primarily helping Shikaku Nara and participating in the planification of the troops, and later with the Five Kage against Madara and Sakura with the Allied Shinobi Forces.
This could be explained by the symbiotic bond Sakura and Tsunade share with Katsuyu through the Strength of a Hundred Seal. 
The seal stores unimaginable quantities of chakra inside, which are used by Katsuyu to perform healing on people. As long as Katsuyu has been transmitted every drop of chakra in the seal, she will continue her work, as seen when Tsunade gave the slug all the chakra inside her Byakugou to the point it disappeared but Katsuyu physically remained in Konoha until her services were no longer needed.
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Tsunade's Byakugou disappears but Katsuyu still serves her purpose as a summon to evacuate Naruto chapter 430.
Still, like any other summon, Katsuyu can be exhausted from battle and disappear. When the Ten Tails absorbed the chakra of every shinobi in the battlefield as the Kurama Chakra Cloak, every Katsuyu fragment attached to them was also absorbed and vanished, but the main body remained intact protecting Sakura Haruno form the tree. 
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Katsuyu's clones disappeared absorbed by the God Tree Naruto chapter 647.
— THE PERFECT SUMMON?
Katsuyu is very different from the rest of summons. 
From the immeasurable amount of chakra it requires to summon her, to her multiple multitasking and supplementary abilities and her mysterious origins, Katsuyu might be the perfect summon and the strongest animal summon of Naruto and Boruto.
Her ability to divide herself in thousands of fragments, a body and chemical composition resistant to blasts that can reshape her own state, no summoning time limit, outstanding healing and regeneration factor, the unlimited wide range communication she offers, acidic attacks, useful to gather intel by herself and turn small enough to offer battle assistant, and a sensory connection with her master and other people she is attached to. 
Katsuyu is the ultimate creature.
Without a doubt, the most essential ally in desperate times. A valuable help in case a village is being attacked by powerful enemies that threaten to destroy everything around them, Katsuyu is the only weapon able to protect thousands of people from any attack and offer assistance while in contact with her master and everyone she is with.
Thanks to her, every Konoha villager that had not been killed by the Pain Paths previously could survive the Shinra Tensei explosion that destroyed Konoha, which later allowed the surviving shinobi to handle evacuations, as well as allow Naruto to obtain intel about Pain and Nagato or be told that Konoha's villagers were revived.
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Katsuyu is an unrivalled intel summon Naruto chapters 431 and 449.
She was also the main link of communication between the Headquarters and the two different fronts of the war, Five Kage and Allied Shinobi Forces, and the reason why the Five Kage survived the fight despite their fatal injuries.
Lastly, it was also Katsuyu who protected the Allied Shinobi Forces against the roots of the God Tree, saving a large portion of the shinobi from death, and later offered a healing area for their future fight against the Kanzeon Lotus King.
— CURRENT WHEREABOUTS.
Ever since the death of Madara Uchiha, Katsuyu has not been summoned again.
With no threats to the destruction of Konoha or the need to establish connections between battlefields, Katsuyu was not summoned in the Blank Period. 
In Boruto, Katsuyu’s debut is strictly linked to Sakura’s appearances: if Sakura does not appear, neither does the slug. This is something that is hard to fathom considering that the village has been exposed to explosions, invasions and multiple deceased shinobi ever since the start that could be prevented by Katsuyu like previous times.
Katsuyu appeared in the anime arc “Kawaki and Himawari in the Academy” where the students had to put on a play about the Sannin and Kawaki dressed as Katsuyu.
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Kawaki representing Katsuyu in Boruto episode 267.
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uchihaculture · 1 year ago
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New Sakura Haruno skin rank S for Naruto Mobile Game.
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ammitastic · 2 years ago
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Blood and bruises warning !
- The Uchiha - The Uchiha (w/ Sasuke's Mangekyō and Sakura's Byakugou) - Sarada's timeskip concept (bruised and Mangekyō activated) - Sarada's timeskip concept (clean)
Plz see me on Twitter
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2virgul · 2 years ago
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normal / lighting
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i tried for the first time
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xlexi7 · 2 years ago
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I will NEVER stop drawing her
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flowerakatsuka · 18 days ago
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felt the urge to make an edit of youkai!kara's awakened form based on the messy ass hairstyle edits i did before
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maikamaki · 17 days ago
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pumiih · 7 months ago
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Thank you to Joseph for this amazing commission!
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meoowwxx · 2 years ago
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AU sapphic #kakasaku sketch bc y’all asked for it
wdyt of fem!kakashi? HokagexAnbu Age gap AU
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generisydtoo · 2 years ago
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As Fantasia once said: “I LOVE IT I LOVE ITTTT”
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byakugouprincess · 2 years ago
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Reminder that Sakura created two dams to store chakra while training for the byakugou🌸
The byakugou requires the user to gather chakra into the seal for three years.
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Sakura created a secondary smaller dam on top of the one reserved for the Byakugou seal to be able perform surgery and fight while steal storing chakra.
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She had to maintain that state for three years and still make sure not take any from the chakra reserves for the byakugou.
She was using a small part of her chakra while fighting sasori, healing and fighting throughout Shippuden and during the first part of the war.
Once she mastered the byakugou seal, she was finally able to let loose.
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Sakura is really on a league of her own!
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primnroses · 2 years ago
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Hi! I would appreciate it much if you could explain it to me like I'm an idiot (I am) but was Byakugou created by Tsunade? (Creation Rebirth was and SothHS is supplementary to it). I ask because I saw plenty of art of Tsunade, Sakura and UZUMAKI MITO (who also had kind-of seal on her forehead) as the users of Byakugou and I'm confused. Also, isn't this connected to Katsuyu? I always wondered how. Like, did Sakura signed a contract before or how was she able to summon her, lmao.
I explained the difference between the Byakugō seal and Creation Rebirth here but I'll sum it up in this ask.
The Byakugō or Strength of a Hundred seal was NOT invented by Tsunade.
The Byakugō no In is a seal that has existed since the the age of the Six Paths according to the Boruto manga, and it's connected to the Karma. Many people, myself included, think that it's a seal from the Uzumaki clan since they were known for their proficiency in sealing techniques and Mito Uzumaki had a similar mark on her forehead.
There is no confirmation about the mark on Mito's forehead being the Strength of a Hundred seal, but it's very common to see art of Sakura Haruno, Tsunade and Mito Uzumaki together as "the Byakugō users". The concept is not incorrect at all, it's very likely that the mark on Mito's forehead was the Strength of a Hundred but she was a background character so it was never brought up.
The Creation Rebirth is a regeneration technique created by Tsunade inspired by his grandfather Hashirama Senju, who could heal his body without using hand seals because he possessed vast chakra reserves. Creation Rebirth works because it needs the large masses of chakra stored inside the seal, so, without the seal, there is no regeneration technique.
Katsuyu is a summon that is symbiotically linked to the Strength of a Hundred seal. A shinobi must possess the seal in order to summon Katsuyu because she doesn't have a summoning limit and her power comes from the seal directly. Katsuyu transforms the chakra from the seal into healing chakra. It's why Shizune could never summon Katsuyu, because she could never complete the seal due to it's difficulty.
Yes, Sakura had to sign a summoning contract to use Katsuyu, because even if she works through the seal, she still needs to be contracted.
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loyal2tray · 2 years ago
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2virgul · 2 years ago
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If byakugou seal remained white as in the original design
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evilkitten3 · 5 months ago
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#itachi trying very hard to hide his obvious disease from the two highly talented mednin that are meant to be checking for that stuff#they allow this bc they fucking hate his guts#tobi also allows this bc tobi thinks watching this is incredibly funny#hidan tries to figure out if tsunade's healing ability is blasphemous or not#he decides it is but he can't do much about it#he does his best to make sure kakuzu is putting him back together instead tho since that's usually more painful#tsunade is fine with this. tsunade thinks hidan could stay as far away from her as he likes forever#hemophobia vs the walking autoerotic torture device#kisame thinks tonton is incredibly cute and is deeply disappointed that everyone thinks he wants to eat her#bizarrely tonton herself isn't too bothered by him. she's worried about that sword tho#deidara gets tired of the safety lectures real fast. he also doesn't like that shizune sides with sasori during art arguments#this is partly bc she thinks deidara is obnoxious and partly bc she likes talking about poison with sasori#konan is both happy to no longer be the only girl and a little uncomfortable bc. y'know. sannin#but nagato is on the mend (ish) so tsunade is a win in her book!#things get a bit awkward when tsunade asks nagato what he's doing with someone else's eyes in his skull tho#tobi has to do everything in his power to keep tsunade from finding out his fake secret identity bc he's sure she'll see right through him#she in fact does not. most of what hashirama told her about madara was. unhelpful in this particular instance#kakuzu is trying to invent time travel so he can go back and if not kill hashirama then at least keep him from reproducing#tsunade is his worst nightmare. and he deals with hidan on a regular basis. he finds a surprising friend in shizune tho#they don't agree on a lot but they agree that tsunade needs to be stopped. this is sadly not possible but the thought is nice#black zetsu is mostly just trying to figure out how distracting tsunade will be to madara when it manages to bring him back#tsunade heals sasuke while tobi infodumps about itachi and she immediately calls him a bitch bc that is NOT how you treat your baby brother#sasuke is her baby bro now (sasuke disagrees with this. tsunade does not care)#(he accidentally refers to her as nee-san exactly one time over a decade later and she never lets him live it down)#jiraiya becomes hokage and has to teach both naruto and sakura which is a nightmare for several reasons#< prev tags#you just did the whole lore on tags omg
pulling it out of the tags bc you peer reviewed it lol
also while we’re on the subject of the akatsuki. I really wonder how long the internal debate was to hire tsunade.
Pros:
shes fucking tsunade
do the akatsuki have a medic: no
do they need a medic: it would be helpful. pein is basically constantly dying.
people she cares about keep dying horribly so there’s a connection there? maybe they could get her on their side??
the goal of the organization is to capture all of the jinchuuriki and tsunade is a woman who is capable of punching an actual bijuu in the face and making it hurt.
Cons:
technically not a missing-nin, she just. kinda went awol. How disillusioned is she with the system. Unknown.
not only is she from konoha, but she’s jiraiya’s teammate. this isn’t a dealbreaker because they did hire orochimaru at one point, but still. complicated feelings.
kind of notorious which is not helpful as a clandestine organization of missing-nin. even if she learned to be more subtle, that would just raise the question of “hey, where the fuck did tsunade go”
if kakuzu has already been hired, this is a shitshow waiting to happen. She’s hashirama’s granddaughter. She’s terrible with money. She cannot be killed. He is already 3 seconds away from an aneurism at all times, this might just make him flip out completely.
Tobi’s Pros and Cons List (secret):
Madara would think it was funny if the last Senju became a missing-nin
If she joins, this might cause jiraiya to come after her. If tobi kills jiraiya, no more icha-icha is published. suffer in your trash can, kakashi.
kakuzu keeps killing all his partners and he would have a lot of difficulty killing her. also he makes very funny faces when he’s angry?? Tobi must weigh his own personal amusement against his organization’s combat effectiveness. Highly difficult.
tobi has never been punched through a wall before!
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vaan-goo · 8 months ago
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My headcanon: Mt and Skr have some similarities (Byakugou, pink = lighter red…) so people often mistake them for sisters. And since Hsrm and Mt are husband and wife, they assumed that Tbrm and Skr are married as well.
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