I noticed that another one of my favorites, Nate Grey didn't have his own appreciation thread so here's one!
Nate Grey aka X-Man aka Shaman of the Mutant Tribe first appeared in X-Man #1 (1995)
He is one of the few escapees from an alternate reality called Age of Apocalypse and the genetic offspring of Jean Grey and Scott Summers aka Cyclops. he was created by Sinister and later saved by Magneto and Forge, who became mentor and a father figure to Nate Grey. During the final showdown of the classic crossover story X-Man fought Apocalypse's son Holocaust and after stabbing him with a shard of M'Kraan crystal they were both transported to 616 reality.
X-Man continued his adventures in 616 and had his own solo that lasted for 75 issues before being cancelled. In the end Nate sacrificed his own life to stop an alien invasion and it seemed that he was dead for good but he made a surprise comeback by pulling his body back together during Dark Reign and fought Norman Osborn's Dark X-Men before being captured.
Later he was nearly depowered by Sugar Man's machine when he was forced to open a dimensional portal. After this he joined the ranks of New Mutants squad when they saved him. He stayed with the team until their title was cancelled and he hasn't been seen since but it's probably just a matter of time before he reappears.