I'd say the Kid is straight and male. Didn't seem to matter much as per the game, but would make the most sense to me.

General Guy is a Shy Guy and pretty asexual. He doesn't really understand the concept entirely.

MDR-27 is a robot, but he is gendered male, and is semi-bisexual, semi-asexual, owing to his mixed understanding of sex.

I don't have a lot of active characters. :E