Codename: Nightcrawler
Real name: Kurt Wagner
Relatives: Raven Darkholme (Mystique, mother), Margali Szardos (foster-mother), Amanda Sefton (Daytripper, foster-sister), Stefan Szardos (foster-brother, deceased), Graydon Creed (half-brother, deceased)
Past: Nightcrawler has blue fur, yellow eyes, fangs and a prehensile tail. He has three fingers and toes on each appendage and can stick to walls. He is a line-of-sight teleporter and is also a master swordsman and acrobat (his boyhood - and adult - idol is Errol Flynn). His teleportation, which smells of brimstone and sulfur and makes his signature "BAMF!" noise, takes him through another dimension, although he only actually saw it once. Generally, though, his teleportation is instantaneous. The opening to the dimension travels with Kurt at all times, distorting light and leaving him in shadow when it's light out, and rendering him nearly invisible when he's in shadow. He also has an infallible spatial awareness, which is necessary for him to teleport, because if he does not judge distances accurately, he could end up teleporting into solid matter, which could cripple or kill him. As a result, Kurt generally only 'ports to places that he can see, or to those that he knows very well, like his room in the Mansion.
Kurt spent his formative years in a traveling carnival with his foster-mother and -sister, but then left to explore the world. Unfortunately, due to his appearance he was branded a demon, and was almost lynched by a mob when Professor X  saved him and recruited him into the new X-Men. Nightcrawler became a charter member of the team, and soon learned to expand his abilities to carry first objects with him and then other people. Unfortunately, people who travel with him tend to get nauseous. Nightcrawler also learned to teleport multiple times in few seconds, allowing him to attack foes from unexpected directions with uncanny accuracy. On rare occasions, he could also teleport more than one person at a time, but it strained him tremendously. Then, when the Marauders attacked the Morlocks and the X-Men went to stop them, Kurt was severely injured by Riptide and went into a coma. When he finally woke up on Muir Island, it was to hear that the X-Men had died in battle with the Adversary. Kurt also found that he could not teleport anymore, at least not without life-threatening strain. However, Kurt still banded together with Shadowcat, Phoenix II, Meggan and Captain Britain to form Excalibur, based off the coast of England. Though the team was in theory led by Captain Britain, Nightcrawler ended up being the defacto leader on many occasions. Finally, after months with the team, Kurt regained his ability to teleport during a battle in Limbo. Later, when Excalibur split up for "vacations" and Kurt was home with a broken leg, he took in the members of the Technet and trained them as the "N-Men." Then Excalibur returned and though Roma revealed that Cap hadn't led the team because of a "blunder factor" she had given him, Kurt remained the leader.
Eventually, though, Kurt and the others discovered that the X-Men were indeed alive, and after Brian and Meggan's wedding he and Colossus and Shadowcat returned to the States to rejoin their friends. In the last six months, though, Kurt, who had always been a devout Catholic, left the team to study to become a priest. Unfortunately, he was ambushed and shot by the Neo, which led him to Dr. Cecilia Reyes, who saved his life, and back to the X-Men team. Kurt flip-flopped between his life as a priest-in-training and an X-Man for a while, even going to Limbo to help his old flame Amanda Sefton (now Magik II) to fend off a malignant evil that was threatening all of the realms of the underworld. Still, he remained committed to both his faith and his friends. However, when his best friend Colossus sacrificed his life to hose the cure for the Legacy Virus, Kurt was shaken to the core. Unable to think rationally, he went out (sans image inducer) and accosted some humans in Salem Center before he realized what he was doing. Just as he fled into the shadows, he was confronted by Sinister, who offered to make a clone of Peter for Kurt, for a "small price" to be discussed later. Kurt refused, and smashed the test tube with Peter's DNA in it. He then returned to the X-Mansion and left a letter for Storm saying that he had to leave the team in order to deal with his doubts about his life, his faith and God.
Not long after, however, Kurt rejoined the team, though it appears he has completed his studies and actually joined the preisthood as well.