#this one'll be an asks series tho

[lil-leon]

imagine the ROTTMNT brothers switching bodies, but because they don't switch brains they have each others quirks/habits.

Like, If Leo and Donnie swapped, suddenly Leo is infodumping about Jupiter Jim and unicorns while stimming.

Meanwhile Donnie is realizing what it feels like to not have the urge to do all of that. At the same time Donnie [instead of staying up late on purpose] is realizing what insomnia is like as well as the concerning thoughts he did not know Leo got.

Raph is being more talkative and rambly because he's stuck with Mikey's ADHD brain and oh wow why can't he sit still-

Then there's Mikey in corner internally screaming because he's dealing with Raph's anxiety and suddenly everything his brothers are doing could be a threat.

It's not a personality swap situation, they still act the same, but they're stuck with bits of each other that aren't 100% personality related.