I'll take a shot at this.
Best Friend: Hmm, kind of tough. I have my friend Jeffrey who is very intelligent, which is very helpful, and my friend Michael who is kind of military oriented (is our schools ROTC program) but a bit gun-hoish at times. I think I'll take Jeffrey
Cousin: Uh, well, personally, I don't have any cousins that I would want on my team. Either way to young (elementary school kids) or probably not the most dependable (teenage 'emo'ish girl *shudders*). So I'll fill this role in with another relative; my brother. Sure, he can be an idiot at times, but he does have that brute strength factor (he'll be our Racheal XD).
Crush: Yeah, don't really have any crushes, and the small ones I do have I'll admit I wouldn't want on my team that much. So let's just insert some standard tomboyish girl or something here that I'd gain a crush on eventually.
Guy I Barely Know: I'll admit that if I didn't know the person that well I wouldn't want them on my team. But since I need to do so to fit the group dynamics...crap, can't think of anyone. The few people who might work for this I know enough about to not want them on my team. Not the best behaved people. Can I just have Tobias, please *puppy eyes* (yes, I'm not afraid to use them). We'll just say the Ellimist did it or something.