I haven't decided for the others, but Eddie is going to lean heavily towards Asexual as his focus has been on science and geeky things for most of his life. He had a few on-and-off girlfriends during his high school years, but he was never very devoted to them. He graduated early at 16 and broke up with his most recent girlfriend before going off to college, and now he's been single for three years. He realized that he just didn't care enough about intimacy to give someone the attention they deserve, and he's been happier than ever now that he doesn't have the burden of a significant other.