Zen, because he is awesome.
Jin Sen, because he is inspirational in the story of his career.
Earl Lee Swagger, because of his awesome look, name and dominating rise to #1 in his class.
Johnny Cage, because he had many losses, but rebounded from them to be a top contender.
I also kinda like Muhammed ^ 3. Certainly I will become a fun if he proves that he is for real in SynCity.
... I also noticed that they are all SynCity fighters. I blame reading the preview story to Syn' 100 shortly after I joined. It really got me hooked on this