I saw that some of the choosable character in Tropico 1 like Papa Doc Duvalier, Anastasio Somoza Sr. and Manuel Noriega are missing. Is this some kind of censored version?

Seems like a weird thing to censor, but they're in mine.

My version of Tropico is 1.5.3. Perhaps you're running an older version?

No, I found it out... It's because I wanted to practice my german-skills, so I downloaded the german version, in which they censored some of the dictators... Why they cut Manuel Noriega out and kept Rafael Trujillo in is still a mystery to me.

I can't believe that, why would they do that? You got any source for this alleged censorship? I can find nothing. The german wiki entry for the game lists all the dictators.

No, it's getting better: in the french version they deleted all dictators and re-named Che Guevara "Carlos Gomez"...

A much more serious difference between some of the english-language Tropico 1 versions floating around is whether they have the Tourette Flaw or not (replaced by the Lazy one then)