I have a naruto worst loser that is always "in use"

I think he didn't remove the naruto from the phantom castle teams. But I am not sure if that's the solution.

Hi, thank you for asking a question. I would say all players cannot use the character, Naruto "The Worst Loser", as an enhancing material. However, I do not think it is a glitch. Since it is a kind of a hero character a player starts with, it is not allowed to be released.