OK, I added these two characters:
Joe Kline (Pier Paolo Capponi, Due once di piombo/My Name is Pecos)
Ramon (Dan Vadis, Deguejo)
All things considered Bill Tate/Nino (Quien Sabe?) seems to me a different kind of negative figure, in my opinion its inclusion would make the list less homogeneous.
To avoid confusion I think is better to consider only the release dates, otherwise Deguejo (release date 4.2.1966), for example, should belong to the previous year and so on, with an indefinite line of demarcation…