Not much is known about Rogue, we donīt know her real name, but we know that her powers emerged early and quickly taught her that she could not touch people without absorbing their memories. She was found by Mystique, who raised Rogue and recruited her as a member of the Brotherhood of Evil Mutants. During a battle with the original Ms. Marvel (Carol Danvers, now Warbird), a disaster occurred: Rogue permanently absorbed Ms. Marvel's powers and memories. Still unable to control her powers and unable to tell her own memories from those of Danvers, Rogue begged Professor Xavier for help. He admitted her to the X-Men and she has been a loyal, brave and valuable team member ever since.
Now, Rogue, is very important for the X-men and very, very, very important to a man called Gambit. They love each other, but they canīt stay together... :(
Rogue was sent flying right out into space by a mutant named 'Binary'. She quickly returned to the X-Manision rearing to fight, a fight that was quickly broken up by the Professor and the X-Men. Binary then expressed her disgust that Rogue was accepted into the X-Men. Rogue then asked why someone she had never even met would hate her, and Binary reverted herself back to her true form of, none other than, Carol Danvers. The X-Men now feeling how unfair this all was to Carol, layed out an ultimatem: either us or Rogue. The Professor, still in Rogue's corner (thank goodness), stated how Ororo had fought tooth and nail to get Wolverine accepted, not for 'his sterling character, but his potential for good'. The X-Men realizing that their leader was right, backed down from their threat, but Carol, having no ties to the X-Men, decided to leave.
With only a short probationary period ahead of her, Rogue had survived her initiation into the X-Men, and is still with them today.