Another Plural headcanon that’s not really a headcanon: Birdy the Mighty /Tetsuwan Birdy
No idea why I watched this show as a young teen but this show has both an OVA (Tetsuwan birdy) and a rebooted anime (Tetsuwan Birdy:Decode) This one is also a fan-servicy shounen just like Rosario+Vampire but the action scenes are really good and Birdy is super strong and defies the whole damsel in distress trope that’s so common in shounen.
This series also has a cool history you can find a video explaining everything here
Minor spoilers just for the first parts
Basically while beating up a bad guy named Geega, A space federation officer named Birdy accidentally kills a random student named Tsutomu, Tsutomu wakes up thinking it was a dream.
The OVA and anime diverge a bit here, with the anime having him think he’s all alone and getting told by birdy who was in his brain that he’s not.
The OVA has Birdy take possession of his hand durning the admissions test and writes down all the answers super fast. He tries to stop the hand with his other hand after getting weirded out. Also when Birdy finally mind speaks in the OVA the translated English literally says “Let’s switch now” which is tulpa/plural terminology!!!
After a few more weird occurrences it’s explained that Birdy and Tsutomu have to share Birdy’s body for a while because his body needs to be reconstructed. Tsutomu kinda has to live his normal while Birdy typically switches back in whenever there’s another bad guy(or to get… ice cream?).
The OVA has the COOLEST switching transforms btw, Enough for me to go watch the whole OVA because I only ever saw the first season of the anime.
So more plural references/proof from the OVA, even though it’s kinda clear that they’re already canonically plural though.
-While eating dinner his sister asks him “Did you make up a new imaginary friend lately” referring to the fact that Tsutomu keeps talking to Birdy out loud. This also leads to weird scenarios where other people think he’s talking to them when he’s just talking to Birdy.
-When in danger, Birdy tries to switch, but can’t and says “We can’t switch until you open up your consciousness” Which is similar to how some systems have to have the person switched in become relaxed before switching
-Birdy can possess parts of the body while Tsutomu is technically switched in.
More switching gifs from the OVA because they’re the coolest.