[quote=@Kimiyosis]
A male character who's sole magic is to 'host'/'swap' out with different 'girls' inside of him, each with their own appearances and personality, and extremely narrow specialization of magic/physical capabilities. However, excluding that magic, the guy is pretty much an ordinary person, using store bought weaponry to fight.

They can talk to each other, although in a strange way. Though the ones inside can communicate by tossing their thoughts into the currently outside person's brain, the one outside has to communicate by speaking aloud, so that they can hear themselves, and in turn, the rest can pick up from the senses. Which usually attracts weird looks.

The guy actually dislikes having to use his magic to fight, and finds the others annoying, but unfortunately he can't shut them up.
[/quote]

Sounds a bit like Sorey from Tales of Zestiria. Except that Sorey accepts the voices.