Tarot was a member of the original Hellions, of French origin. Unlike some of the more mean-spirited Hellions (namely Empath, Jetstream and Roulette (Jennifer Stavros)), Tarot was generally sweet and sympathetic. It was revealed by Mirage's psychic abilities that Tarot was in fact in love with one of the New Mutants, probably Cypher or Sunspot.
She was ostensibly killed by Sentinels under the command of Trevor Fitzroy.
She reappeared later as a member of the second Hellions team. It appears her resurrection and life force was somehow bound to King Bedlam, though this was never fully explained.
On M-Day she lost her mutant powers, along with King Bedlam. Apparently since King Bedlam's powers kept her alive, when he lost his powers, she died again.
Her death was short-lived as she, along with all other deceased Hellions, were resurrected by Selene and Eli Bard using the Transmode virus. She was able to use again her powers on that occasion, although the statement that designed her depowered.
Marie-Ange is a shy, akward, fragile teenager she is also meek to figures of authority and lovers. Being insecure she is always fiddling with her tarot deck. However Tarot has shown a little bit of an assertive, cold, bitter and sarcastic attitude occasionally.