#12Donnie adopts R!Leo

[fullofpossibilities]

Adopted Au Headcannons for R!Leo

So this is very heavily based off of the Adopted Mikey Au and the Adopted Donnie Au done by @tblsomedoodles so if you don't know the basics that would be a great place to start. (They also gave me permission to write these headcannons to thank you again!!!!).

Basically, I was at work, and absently thinking about their Adopted Aus, and thought, "who would adopt R!Leo (otherwise listed as Blue) if he went missing in another dimension?" And first some reason the first person that popped into my head was 2012 Donatello, so this is that train wreck.

Keep in mind that Blue is, like, 3-4 yr. old in this au, and happened to get sent to the 2012 universe after being attacked in the sewers of his own dimension and doesn't go back to his home dimension until right before the Rise show starts.

Purple is R!Leo's comfort color (since it reminds him of his twin) so I can see Donnie being the first person he would latch onto.

-It helps that the reason Blue is in this universe would be a highly coincidentally timed portal on 2012 Donnie's end that transported both Leo and the mutant attacking him to the sewers nearby

Donnie goes to investigate the energy surge that happened during the fight and finds Blue, saving him from either the mutant that had been attacking him prior to the portal or the krang who might have been the reason for the portal in the first place, haven't decided yet. Donnie takes him home to patch him up, and gets imprinted on by a very lost, confused, and scared Blue who just wants his twin but hey this stranger is wearing Purple's colors so he must nice, right?

Blue obviously gets most of his sense of humor and energy from Uncle Mikey. They love to skateboard together and play pranks, usually involving a lot of messes to clean up. Both get into food competitions, where whoever can throw together the weirdest food combination and eat it without throwing up wins (Donnie always gets upset when they do that though, worried about Blue's health).

Uncle Raph is probably (read definitely) the most protective of the uncles, and even though he isn't the sensei, he still helps teach Blue how to fight. He'll introduce him to Chompy and show him to use the pinball machine, and if anyone accused Raph of going soft he'd slap their head then go get Blue for their scheduled nap (because Blue will only sleep if someone else is there). Blue likes that Raph is so big, because it reminds him of Red (even if Raph is bigger than he remembers Red being), and naps with him are the best (but he'll never tell his dad that). If I do include the fact that Blue gets plushies that remind him of his brothers like @tblsomedoodles did in their au, they were made/knitted by Raph (once again, something he'll never admit, he just claims he found them randomly)

Uncle Leo, of course, is the sensei, but they still interact outside of training. Out of all the uncles, Blue probably looks up to Leo the most, resulting in another "Splinter Junior" situation, but between Leos, and less copy but no less "hero worship." Leo is like the Jupiter Jim or Captain Ryan of Blue's childhood. Leo will introduce Blue to Space Heroes, and the two will spend hours basically fan-boying over the show.

Obviously Blue is closest with his self-assigned dad, Donnie. Donnie is the reason that Blue gets so interested in medical practices and chemistry, and Donnie has a lot of practice (cough Mikey) with grabby hands in the lab, so he knows how to keep an eye on Blue while still working in a way that lets Blue stay in the lab during the day if he wants to. Blue thinks his dad is the coolest guy ever, being able to make whatever he wants (He built such a cool car! and Metalhead was awesome!) and fixing anything that breaks (like his toys). He learns sarcasm by watching his dad talk with Uncle Casey, and boy was that something that Donnie will always regret (second only to the fact that Casey also seemed to be trying to teach Blue how to flirt). (side note: this would be in a universe that did not emphasize a lot of romance. While all of that drama still happened when they were teenagers, the only couple that I MIGHT have as canon in the Au would be Raph/Mona, because it was the only ship that didn't have some kind of problematic background). When Blue decides that his dad hasn't slept enough, he'll go and sit on his lap, and just start to fall asleep. In an effort to make him comfortable, Donnie will try to move him to the bed, and when he tries to go back to work, Blue will latch onto his arm and refuse to let go, forcing him to stay "just until Blue falls asleep." Leo walks in ten minutes later to the father-son duo practically dead to the world on the bed. On the other hand, if Donnie doesn't want to be disturbed by anyone, Blue will make it his personal mission to keep the uncles out of the lab.

It's unclear when exactly Donnie became Blue's "dad," it just happened one day with Blue walking into the room, half-asleep, and asking his dad (by his now new title) if he had seen his blanket/plushies. Donnie, understandably, freaks out internally (and later externally) but can't deny that something in him was both happy and sad: happy because he had grown attached to the little tot; sad because he knew that a time would come when he would have to send him back home (dealing with alternates has left Donnie with the very real realization that this is probably a another little Leo, especially after hearing Blue talk about his brothers). Among the infinite possibilities of universes, though, that would take some time, so maybe it would be ok for the kid to call him that? He'd ask for advice from his brothers and April, and all of them, while equally cautious, would encourage him to let it happen because dangit they're attached too (although Leo would be the most hesitant, with his sense of responsibility).

I'd like to think that Blue learned Spanish by watching tv with April and Casey. Sure, he watches tv with his uncles too, but I can't see them watching anything that might have Spanish in them. I'm imagining that April and Casey were babysiting and both fell asleep with the tv on (thinking Blue was asleep too). Some Spanish drama came on and little Blue fell in love with the accent, so he started trying to copy it. Donnie caught on and set up a system to teach him some of the words instead of just copying the accent (he doesn't know spanish, but there are a lot of learning programs online he can hack into). It becomes a bonding experience between little Blue and the humans, since they take it upon themselves to help him learn whenever they babysit (April being more successful in these lessons than Casey).

Blue was seen as very athletic in Rise!, so I imagine that he fairly enjoys sports. Watching Casey play hockey probably kick started it, which evolved into skateboarding, basketball, baseball, football, etc. He couldn't play all of these a lot, but skateboarding and basketball (or at least shooting hoops) were fairly simple to set up and do constantly. He likes baseball and football simply for the fact that it gives him and excuse to throw a ball and run around a lot, but he doesn't play them often and prefers the other two. His uncles help set up a basketball hoop in the lair for one of his birthdays, and all he did for the next week was shoot hoops.

He thinks April is cool. Leo may be Blue's personal hero, but April is a SUPER hero. She had powers and a cool outfit, and in Blue's mind that's all he needed to label his new favorite aunt as an honest to goodness superhero (followed later by Mikey's alter-ego Turflytle). He's always following her around when she visits the lair and trying to get her to make him "fly."

Instead of the lair being attacked by the mutant/yokai that tried to kidnap and eat Blue, I imagine that the event that triggers Blue's return to his original world involving the Krang. The Krang attacked the lair or there was an attack outside somewhere that Blue snuck out and got stuck in, but a Krang would attempt to drag Blue through the portal to use as bait or leverage, and Blue's ninpo messed with the portal and sent him home (without the Krang for some reason, idk its fanfiction so fanon magic). He returns to the same place where he disappeared in his world, not that he remembers that that is where he left, and instead of Tello or Angie finding him, it would be Raphie (because I'm trying not to be too similar to the original Adopted AU, no more than I already am). The rest of the Rise show continues as normal.

Maybe if I get more inspiration I'll do some headcannons for when R!Leo reconnects with his family in the 12 dimension, but for now this is all I can think of.