Gambit is Remy Lebeau, a charming, sexy and handsome french mutant, with the hability of charging things telecinaticly (cards are his favorite).
His family belongs to the thief league, wich is rival of the assasins league.
His past has always been a mystery, but was revealed not so long ago in Uncanny X-Men #350. There, Magneto, using a different autfit and under the name of "Erik the Red" created a trial for our red eyed hero. As jury were Beast, Maggot, Rogue, Psylocke and a human woman. Archangel was his defender, who couldn't do such thing after knowing what was the charge about... the Morlocks massacre! He was tottally devasted after Bella Donna's death and agreed to work for Sinister, who asked him to penetrate the Morlocks community.

Then Erik forced Rogue to kiss Gambit and absorb his memories... Then she sees him watching the massacre agonized and salving one boned little girl. After that they get themselves out of that place and she and Remy talk about what just happened. She says dreadfull things such as he will never be an x-man and that he can't go back to the mansion cause he's got no home. He says he loves her (oooh, how cute!) and she answers that he "must be true for those he loves, otherwise it's a gamble".... She leaves him in the Artic.
Well, I haven't figured out yet how he and Rogue have fallen in love for each other and how he got into the X-Men i nthe first place, so... if you know these facts, please 'mail me, ok? I REEEALY want to know that.