Ash - uses his own personal style that is rooted in Savate. It emphasizes speed and precision with pinpoint applications of power for the most devastating effect

Luke Cage - street brawler with LOTS of personal experience, later learned a little K'un L'un style kung fu from Iron Fist to help give him a little more utility

Chun Li - studied kung fu from Gen as well as her father, also incorporates bits of tai chi, kickboxing, and police hand to hand techniques. Obviously a major emphasis on powerful kicking moves.

Takamura - uses boxing though he started out as a street brawler. Very versatile in that he doesn't focus on just one style/strategy when boxing and can shift from one to another

Rock Howard - hybrid style mixing moves he learned from Terry Bogard (who also uses a mixed moveset) along with his father's style which he just....knows.