The Nightcrawlers of the Marvel universe

Hey to all the nightcrawler Fans out there.
So if Du follow marvel closely, Du get to find out that there are many universes/earths in which there are different versions of our marvel heroes. This has been a part of the marvel universe since pretty much the beginning of time.

So I've always wondered, how many versions of Nightcrawler are out there? I could never pin point them all and know quite a few.
Which ones do Du guys know of?
Which one oder ones are your favorite(s)?
And why?
I would Liebe to know and see where the conversation would go on the subject