I love Nightcrawler.
[peeweevoice]If you love him so much, then why don't you marry him??[/peeweevoice]
Well I would, but he's not real.
Ahem... anyway.
I'm going to be totally un-hipster and say honestly that his appearance in X2 was when I first knew of his existence. I loved X1, but that awesome, kick-ass fight scene in X2 was what got me to start reading the comics. And then I fell even more in love with the comic book character and kept wondering why they squished Alan Cummings' smarmy personality, perfect for the classic, swashbuckling Nightcrawler, into a meek religious dude (mind you, I haven't gotten to the part where extreme religiousness happens to him in the comics, yet. YES, I know he was always Catholic!)
I think it would be great if they explored that personality change in Apocalypse as a subplot. You'd think anything involving more character development for Mystique would be an automatic in for these movies...
Prepare yourself for a speculative fan script pitch, citizen!
The prologue:
1963. Magneto says his goodbyes to Mystique, says there's something he needs to take care of in Dallas. Fond goodbyes and sexytime happens. He instructs her to rescue Azazel from certain death and lay low for a while in Russia.
Azazel is imprisoned in a gulag, about to be executed. Mystique frees him and they escape West into the Russian wilderness. Sexytime happens because boredom and Azazel is good at seduction. Many months later and Soviet thugs are after them again. Azazel hunts them down and brutally kills them, giving Mystique second thoughts about fathering a child with a sociopath. Besides it's probably Eric's baby anyway... probably... She takes off towards Germany, stealing Azazel's sword for good measure, with a bun in the oven.
Just after crossing into West Germany, she goes into labor, and is taken in by kindly circus folk. The baby definitely isn't Eric's. She finds out in passing that Magneto was arrested for the assumed assassination of JFK. She's got no one to go back home to.
Last shot is of a crying baby Nightcrawler left alone on a bed with Azazel's sword.
The not-so-distant future:
Cyclops and Jean are finally tying the knot. Nightcrawler is the priest doing the honors. He apologizes to Jean for lying about his tattoos when they first met... they don't represent his sins, he got them when he was young and impressionable. He was a different man then, he never took anything seriously, hinting that something bad happened to him he doesn't feel like talking about. He admits he lied because he was trying to impress Storm.
During the wedding, holy poop, Apocalypse possesses Jean and some other people that are transformed into Horsemen. The Phoenix rears her ugly head and destroys most of the wedding party except Wolverine.
Wolverine goes back in time again, preferably in a different way than DOFP.
1983:
(this part is completely par baked) Wolverine finds Mystique and they need Nightcrawler, perhaps to help them find, move, or destroy Apocalypse's hibernating body before it wakes up. They find Kurt in the circus, totally hamming up his acrobatic skills. He has his beloved sword, Excalibur, strapped to his back. He is 20 years old and just got his first tattoo. On the way to wherever they need to go, they are witness to a woman being robbed. Nightcrawler jumps in without thinking and attempts to wrest the gun away from the bad guy, and the gun fires, killing the woman. Throughout the rest of the movie, he tries to rationalize what would have happened if he'd run the man through with Excalibur, would he be a hero for saving her or a murderer? Plus the tension between Mystique and Kurt... to tell him or not to tell him?
And then when the emotional subplot is resolved, the Kurt of the not-too-distant future is a bit more laid back and happy-go-lucky, with only one tattoo.
............
Well, that was TL;DR wasn't it? Retcons galore! That's what I hope happens, but I know they probably wouldn't put that much emphasis on Nightcrawler in any movie. Oh well.