I'm picturing Anders as a local, living in the college dorm just because his father is happy to pay to get him out of the house. Dan, his father, is a big, burly contractor who's resentful of the kid, who's blatantly not his son. Dan would have gotten a divorce, but River, Anders' mother, is old money. So, for the benefit of a nice bank account, Dan sticks it out and sticks it to his secretary.
Anders is usually pretty easygoing, so long as people are accepting of others. Show any racism, sexism, ableism, or other isms, and he'll point it out to give an opportunity to adjust. Double down on the ism and you've made an enemy. He's happy protesting, doing charity work, dancing, flirting, and gossiping. Sexually, he's pretty queer. An androgynous, bisexual switch who occasionally enjoys dressing like a pretty tomboy.