Mustached Cowboys

Many mustached cowboys made cameo appearances in Bruce Lee vs Clint Eastwood. They were all portrayed by Nice Peter. One appeared as Billy the Kid in Lewis and Clark vs Bill and Ted.

Mustached Cowboys
The mustached cowboys most likely represent the antagonists from Clint Eastwood's western-themed movies, or somewhat antagonistic cowboys in general.

Appearance in the rap battles
They tried shooting Clint Eastwood, but they all were shot by him instead. Occasionally, some would change into urban ninjas when entering Bruce Lee's side.

A cowboy also appeared as Billy the Kid, waving his guns during Bill & Ted's line, "We'll quickly be spitting like Billy the Kid with his guns!"

Trivia

 * This is Nice Peter's second non-rapping character. The first was John F. Kennedy.
 * In the Behind the Scenes video, Nice Peter wore his mustache on his forehead, commenting that he looked like a "Romulan Cowboy", a reference to the alien species from the Star Trek universe.
 * They are the third people to cross the "line" in a battle. The others are John Lennon and Adolf Hitler.
 * They are the first cameos to do this.
 * They are the third cameos to appear as a cameo in a later battle, after the Stormtrooper and Carl Sagan.