I'd say it's between Crim, Sora, and Silver Knight. I like a lot of the other cast members, but I basically see them every episode, and some of the charm wears off halfway through the show with them. Crim is a hero who lives and dies by his morals, Sora is a childish backstabber, and Silver Knight is the soldier who overreaches his authority but has good intentions as to why he does so.
I also really like Macha because she is a great portrayal of a silent character. Actions speak more than words.
my favorite //SIGN character is definately Crim he is like a manlier .hack version of Benimaru (King of Fighters) lol And of course there is always Sora, i just loved that he robbed ppl for there contact information!
I don't really have a favorite,I liked everyone except Sora and BT.Sora was such a nuisance in my opinion,and BT..well...betrayer much?But if I really HAD to choose,it would be between Tsukasa and Mimiru o3o