#pretty much everyone who isnt starscream or swindle is a valid choice in my opinion

[aggressively-crying]

Alright let's break this down bot by bot

Megatron

Pros: Unbelievably sexy voice. Expensive taste, would spoil you. Nobody would dare disrespect you if you're Megatron's partner. Gladiator poet, you're gonna get so many love poems written for you.

Cons: Just because he loves you does not mean he won't manipulate you. Leading the Decepticons is busy work, he may not have a lot of time for you. Does NOT do his share of housework.

Blitzwing

Pros: You get three different faces to kiss. Good taste in movies. Very willing to try new things so you don't have to worry about stagnating. He's smart, he's hilarious and he's willing to throw down to protect your honor so you're really getting the whole package. I'm willing to bet he's actually pretty affectionate, or at least less tsundere than your average con. The accent's kinda hot. What that tongue do?

Cons: Very impulsive. Talks to himself a lot and 2/3 personalities have pretty bad volume control, so you're not gonna be getting much peace and quiet. Mild rage issues so not a great choice if you're prone to screaming matches. Deflects his insecurities with self deprecating humor a lot so if something's genuinely bothering him, having him communicate that would be like pulling teeth.

Starscream

Pros: ...Well, at least he's pretty to look at.

Cons: Most likely to cheat on you but equally likely to baselessly accuse you of cheating on him. Refuses to admit when he's wrong. Bitches about anything and everything. Lies about shit that doesn't matter to make himself look like the victim. If you actually do something wrong and don't know what it is, he'll give you the silent treatment and will NOT let up. Will leave for weeks at a time, come back and act like nothing happened.

Soundwave

Pros: Lots n lots of pets. Good music tastes, writers you songs. Fiercely loyal. Very bulky, there is much to love. Still has the chest compartment which, assuming his partner is human, would make a phenomenal spot for naps.

Cons: Prone to making really bad assumptions on limited information. Really stubborn. A bit emotionally unavailable because he thinks he needs to uphold the cool, stoic, emotionless persona. Is gonna take awhile to get over his anti organic prejudice.

Shockwave

Pros: Cultured, a man of taste. Pretty lonely and definitely touch starved so you will not be going ignored as long as he's around. Can change size to suit big spoon/little spoon preferences. Loyal til the end. Affectionate without being clingy, has no problems trusting the people he cares about. Remarkably patient. Big tall goth cryptid man, overwhelmingly sexy.

Cons: Might be willing to murder you if you get in the way of the decepticon cause. Tends to put work first and given the whole spy thing, he likely won't have much time to spend with his partner. Has a good deal of insecurity about his appearance given he's an empurata, very awkward about being looked at as desirable or attractive beyond his usefulness.

Lugnut

Pros: He will fucking worship you. This is a mech that will treat you like royalty and use every breath he takes to sing your praises. Will protect you without making you feel lesser and hype you up at every opportunity. Big sweet himbo.

Cons: You're gonna have to live with his attention being split between you and Megatron. He does not tolerate dissent towards his master or to the decepticon cause. Sometimes it feels more like he's in love with this ideal version of you he's put on a pedestal than actually being in love with the real you.

Swindle

Pros: Smooth talker, but the charisma is about as far as it goes.

Cons: Do not for a single moment think he wouldn't max your credit card at every given opportunity. He will sell you for one rust stick.

Conclusion: ??????