Mental Disorders?

My friend legitimately has a tulpa/split personality of sorts that 100% resembles Rainbow Dash. Like, he'll freak out, become really pissed, and then he'll "go away to his mind garden" and Rainbow Dash will take control of his body. And sometimes she'll just input on things for random reasons, and he will appear to have no recollection of what he just then said. It sounds like a joke, but me and him have been friends for a while. I don't think it's a lie, because I've sat down with him to talk about it, and he swears that he doesn't do it on purpose.

Weird stuff. I'll give you his Skype if you want, Bonnie. xD. Maybe you can talk to him about it, etc.