Mercury (Cessily Kincaid) is a fictional character appearing in American comic books published by Marvel Comics. The character has appeared in the X-Men series. She is a teenage member of the student body at the Xavier Institute and a recurring member of the X-Men. Publication history Mercury first appeared in New Mutants, vol. 2 #2 in Aug. 2003. Fictional character biography Introduction Cessily Kincaid, an Irish American, was raised in Portland, Oregon by her parents Mark and Jill, who, according to DeFilippis, used to dote over her. When Cessily's powers manifested, her parents were disgusted and made her stay indoors so as to hide her mutation. In response, she was sent to the Xavier Institute where she befriended Julian Keller and was placed as Laurie Collins' roommate for a while. After the school was rebuilt, she was selected by Emma Frost to be on her Hellions squad. She's extremely close to Santo Varroco and Julian Keller whom she spends most of her time with and looks upon like big brothers. During that time, she developed a crush on her teammate Wither, but her feelings were not reciprocated. Hellions Miniseries The Hellions squad won the squad challenge, and during their summer vacation, they travelled with Julian to his home. There they encountered the Kingmaker, from whom they each received a trial wish. Cessily's wish was to have her parents accept and love her, a wish the Kingmaker granted by manipulating her parents with telepaths. When the Hellions eventually refused a permanent deal with the Kingmaker, Cessily's parents reverted to normal and Cessily returned to the institute, defeated. Decimation After the events of M-Day only 27 students were left with their powers, including Cessily, although she would have preferred to lose her powers and was devastated that she did not. The depowered students and staff were sent home. One bus was bombed by anti-mutant religious zealot Reverend William Stryker, and Cessily's former teammate and friend Tag was among those killed. The X-Men held a funeral for those students whose parents would not accept them, and Cessily's anguish was very visible. All of the remaining students were placed by Emma Frost into an all-out brawl, and the ones deemed to be the best were to be assigned to become a group of in-training X-Men. Cessily made the team and began training to become an X-Man. Childhood's End and Nimrod In the Childhood's End