Well, to me, Tony is more than just a smart freak. He's like a kid with cancer or some other major illness. He just acts so much older than he really is because of the crap life has dropped on him. I'll agree he's not all that original (feels a bit too much like Bean for my likeing, but maybe Bean is where he got some of the ideas for Tony from. Bean is the main character from Card's recient Shadow books (Ender's Shadow, ect.)) but I think he works for Tony. He had a bad/too short childhood, and so now, the Tony we know and love, is trying to make up for it with his millions of dollars by just having fun.
Rhodey is far from a token angry black kid. He is a perfect match to Tony, a smart kid who is a little too smart for his own good. He gets good grades, and so the other kids think he cheats or something and try to get/force him to help. Rhodey may not be well developed yet, but he's only had two issues, and it is called Ultimate Iron Man, not Ultimate Iron Man and Friends. It'll be interesting to see what the three kids do about school in the next issue.
Antonio may be the rich guy who tries to do the right thing, but at the end of 4, we see that he is really regretting sending Obadaih to the Baxter Building. He thought that by sending him there, he would keep him away from the rest of the world for a while, and maybe the kid would grow up and not be an ***. Its a failing of adults in a lot of liturature about kids, the "bad" kid is sent away or something similar in a hope that they will grow out of whatever it is that makes them evil. Antonio seems to have realised that maybe sending the kid there wasn't such a great idea after all.
Zebediah wasn't very fleshed out either, but we only saw him for a little bit. He was pretty much just a foil for some of the things Card wanted to set up. Force Antonio into running, making Tony grow up really fast. Card really likes forcing children to grow up fast.
Obadiah feels too much like (I'm not sure I'm remembering the name right, someone reading the Ender's Shadow books tell me if I'm wrong) Andre. Evil kid who likes to tourture/trick younger kids into doing what he wants them to. With a little edjucation, he becomes good at doing it with adults too.
Loni Stane was a crap character, but without her, Zebediah would never have had the lever to force Antonio on the run.
Next argument in the next post.