Chun Li's father was killed by
M Bison (or
Vega if you're playing the Japanese version), who is the leader of
Shadowloo, the criminal organization that organized the
Street Fighter tournament. She entered tournament in order to get a chance at avenging her father's death.
In Street Fighter II Turbo (Hyper Fighting), she gained a fireball move (sho oken), and in a later game, she lost the ability to perform the spinning bird kick.
Her blood type is A btw.