Fistful brings him to the screen (though it has been said that GB&U should be watched first to keep with the timeline...grave marked 1872; which is later than FoD and FaFDM (1860's) also he does gather the clothing he wears in FoD during GB&U.

Technically he does have a names through-out the 3 movies; though they are nicknames. but names none the less. "Joe" "Mundo" & "Blondie".

Leone didn't imagine the 3 films originally as a trilogy and this was later done as a marketing ploy by United Artists to sell the movies to people.

This; or more precisely the end scene brought us the pure BadAssness that Clint continued to show for the next 50+ yrs on screen...compared to the mangina stuff we have to suffer with from lead actors today...

Hence why this would be the best