Nightcrawler (Kurt Wagner) is a fictional character, a comic book superhero in the Marvel Universe. He has been associated with both the X-Men and Excalibur, originally appearing in comic books published by Marvel Comics. Created by writer Len Wein and artist Dave Cockrum, he debuted in Giant-Size X-Men #1 (May 1975). During the "X-Men: Second Coming" storyline, Nightcrawler is killed in an attempt to save Hope Summers in X-Force #26 (April 2010).
A mutant, Nightcrawler possesses superhuman agility, the ability to teleport, invisibility in deep shadows, and adhesive hands and feet. His physical mutations include blue skin, two-toed feet and three-fingered hands, yellow eyes, and a prehensile tail. In Nightcrawler's earlier comic book appearances he is depicted as being a happy-go-lucky practical joker and teaser, and a fan of swashbuckling fiction.
Source: Wikipedia, "Nightcrawler (comics)", available under the CC-BY-SA License.