"with it's clueless and campy marketing style" --> " with its clueless and campy marketing style"

Mr. Montalban was probably the most significant Latino in Star Trek.

I assume you're referring to the characters, not the actors, since you cite Chekov as a Russian. Khan was not Latino; he was a Sikh from northern India.

http://en.wikipedia.org/wiki/Khan_Noonien_Singh
http://memory-alpha.org/en/wiki/Khan_Noonien_Singh