Kurt Wagner, the German-born mutant named Nightcrawler, first appeared in Giant-Sized X-Men, and Marvel have kept him around.
Some of my theories to Nightcrawler next true origin (more in
Do I like the Nightcrawler retcon? Yes. Is it convoluted? Also yes
Marvel: 10 Things Everyone Forgets About Nightcrawler
X-Men: 5 Times Nightcrawler Was The Best Mutant (& 5 He Was The Worst)
Nightcrawler (2004) #10, Comic Issues
Marvel: 10 Things Everyone Forgets About Nightcrawler
Rogue, Mystique, Sabretooth & Nightcrawler: Their Twisted Family
Time for the fuzzy elf. Day 10: Kurt/Nightcrawler. What is the
Marvel: 10 Things Everyone Forgets About Nightcrawler