People can do what they want for the most part, so long as they're there for missions and they have the backs of everyone else in the SSS. I'm not going to tell you that you can't run for student council or join the baseball team if you want to do that. The only rules that you have to follow are that you can't pressure anyone into telling you about their past, we protect each other, you have to show up for dinner, and you participate in missions that fit your skill set when you're asked.