Zylo, all the way, man. I thought he was really cool. Also Ballbaroy (wow, how do i remember this? lol) Not much into the human characters that much, but the main character looking really geeky until you promote him allot is a big bummer to me. I used to keep him behind the enemy lines because at first he died allot for me. That got extremity annoying so he stayed the same until the end where he died and magically got promoted, lol.
I played the first SF on the PC but I also heard I could get it from Sonics Genesis collection for my Xbox. I think i'll stick to the PC tho.