Al Leong. Among the characters he's played are Henchman, Chow's Henchman, Asian Looking Thug, Chinese Gunman #9, Chinese Warlord, Triad Member, Asian Thug Robber, Yakuza Assassin, and Genghis Khan Al Leong - IMDb
Noel Gugliemi, the "you ever have your shit pushed in?" Sureno from Training Day. Noel Gugliemi - IMDb Some of his role: Gang Leader, Gang Member #1, Street Thug, Mexican Mafia Soldier, Hood, Latino Convict, Bar Thug #2, Warhouse Hood, Cholo #2, Gang Banger 1.
Because Hollywood is white. I'm not saying that Hollywood is racist by the way, just saying that it's essentially white so the use of other races tend to fit into certain stereotypes. Blacks suffered the same thing for the longest time too. In terms of white actors....Jason Statham is always some action tough guy. Jason Bateman and Owen Wilson are always some semi comedic annoying cunts.