Well, technically, the series in Japan is just called "Vampire," with "Vampire Savior" being the last major upgrade(there were 2 Japan-only upgrades to Vampire Savior, but neither were that significant).

Sorry, when it comes to Capcom, I am quite a bit nitpicky.

Anyway, my favorite characters are Donovan (yes, I'm aware he's not in the first Savior :P) and B.B. Hood (Bulleta in the Japanese version). I love all the characters but those are the ones that stand out.