First Good Vampire?

No.

On Dark Shadows (1966), Barnabas Collins started out as evil but became good (after the writers decided to keep the character around instead of killing him off as originally planned).
If you want to include comedy rather than just drama, there's Grandpa & Lily Munster, from The Munsters (1964).
And, of course, Count von Count from Sesame Street (1969), but I don't think that's quite what you had in mind.

I'm sure there are others that predate FK, these are just the ones that sprang to mind.
Maybe someone else can think of better and/or earlier examples.

angel and spike both were introduced as bad vamps on buffy. but latwer became somewhat good guys

"Touchdoooooooooooooooooooooooooooooown Auburn"

I do not believe there is such a thing as a good vampire. Nick was not a good vampire, but a good person. He did not like being a vampire. It was not good, but Nick, the person he was inside was what was good.

"Do All Things For God's Glory"-1 Corinthians 10:31
I try doing this with my posts

I love the series, has a few things I don't agree with but still I loved it. I wish it stuck with the American pilot one with Rick Springfield. I guess audiences were ready for it but when Canada took it years later and changed the pathologist to a woman they were more then ready.

For anyone else who comes across this (since all these posts predate the move from IMDB forum)...

Seeing that this was a remake of the 1989 TV movie Nick Knight staring Rick Springfield, the answer would be no.
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Never believe or disbelieve. Always question. Rebuke bias, a.k.a. groupthink, a.k.a. ideology, the bane of skeptical, logical reason.