The eleven regulars
The eleven I had in mind are (they get less and less famous down the list):
Morris Chestnut (sidekick in Under Siege 2, bad guy in Half Past Dead)
Peter Greene (bad guy in Under Siege 2, cop in Ticker)
Peter Jason (chief in Marked For Death, Millie's Dad in Glimmer Man)
Kurupt (Twitch in Half Past Dead, Everton in Yakuza)
Andy Romano (general in both Under Siege films)
Dale Dye (captain in both Under Siege films)
Nick Mancuso (Tom Breaker in both Under Siege films)
Afifi Alaouie (female merc in Under Siege 2, dancer in Out For Justice)
Miguel Nino (Chi Chi in Nico/Above The Law, Commando in Under Siege)
Joseph F. Kosala (Lieutenant in Nico, "Wheres Miss July" guy in Under Siege)
Robert LaSardo (knife punk in Hard to Kill, villain in Out For Justice)
I'm sure as someone said there are tonnes of stunt people who regularly appear in his films too.
Steve