Sage

First appearance: Uncanny X-Men #132
Eye color: Blue
Hair color: Black

Powers:
• Ability to store and analyze data like a computer,
• Limited telepathic ability,
• Ability to reverse telepathic attacks directed at her,
• Ability to catalyze mutation in people with the X-factor gene (allready manifested or latent).

History: Sage Was first recruited for the X-men by Charles Xavier while she was a teenager, he asked her to become a spy inside the Hellfire Club. While there, working as Sebastian Shaw's assistant, Tessa used her Mutant powers to help Charles Xavier. On one occasion she met the young Betsy Braddock, on a mission inside the Hellfire club, simillar to her own. She warned Elizabeth away, partly to protect her and partly to protect her own undercover mission for Charles Xavier. If only she had been able to do the same for Phoenix...
Years later, Tessa left Shaw's side and went back to join the X-Men fully. Tessa also made an attempt to persuade Senator Kelly not to run for President on an anti-mutant platform, saying that by doing so he became no better than Magneto, who he felt was opressing the human race and threatening it with genocide.
Soon after this, Tessa joined Storm's renegade 'X-treme' X-Men team, taking up the new name Sage, searching for the diarys of the precognitive mutant Destiny.