[Tripper]

Vincent (Tom Cruise) - Collateral
Kenneth (Ving Rhames) - Dawn Of The Dead (remake)
Captain Jack Sparrow (Johnny Depp) - Pirates Of The Carribean
Alonzo (Denzel Washington) - Training Day
Ed & Shaun - Shaun Of The Dead
Ricky Slade (Vince Vaughn) - Made
Nigel Tufnel (Christopher Guest) - This Is Spinal Tap
Corky St Clair (Christopher Guest) - Waiting For Guffman
Marty McFly (Michael J Fox) - Back To The Future
Most of the cast of Dazed And Confused (No real "main characters" in it)
Lloyd Christmas (Jim Carrey) Dumb & Dumber "CRIIIIPESSS!"
Chris Tucker (Franklin Hatchett) - Money Talks
Bernard Focker (Dustin Hoffman) - Meet The Fockers
John McClane (Bruce Willis) - Die Hard

....and more I can't think of.... happy: