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.

[volume & issue needed] She's extremely close to Santo Varroco and Julian Keller whom she spends most of her time with and looks upon like big brothers.

[volume & issue needed] In the Childhood's End arc, Cessily and the New X-Men defeated Stryker, Josh killing him.

The team successfully defeated the robot due to combining the powers of Surge, Mercury, and X-23, and Nimrod was sent back in time.

When she replies that her friends will come for her, Kimura informs that "The Elephant" (Mammomax) said the same thing while showing a picture of his corpse in a cell.

Before dying, Stryker had requested a living weapon be made, a huge beast called Predator X. Mercury's metal skin was needed to give it added powers and durability.

[volume & issue needed] Mercury is recovering in bed after what happened to her in the last arc when the students are teleported to Limbo.

She and Dust go up against Belasco and keep getting beaten down but refuse to give up, as both their mutant bodies are resistant to his magic and fight an inconclusive battle until Darkchylde and the other students arrive, teleported by Pixie.

Mercury continues to fight alongside the other students, but can only watch as Belasco fends them off and proceeds to pull Earth into Limbo until he is defeated by Darkchylde and Pixie.

Mercury then describes in detail the deaths of Laurie Collins and Brian Cruz, causing the Hulk to understand his self-righteous tantrum is wrongly directed towards Xavier's affiliation with the Illuminati.

Seeing these graveyards reminds the Hulk of his fallen companions on Sakaar, and with that understanding, he leaves Xavier unharmed.

[volume & issue needed] Cessily still maintains her disapproval and distrust of Emma Frost after overhearing her conversation with X-23 during the "Mercury Falling" arc.

She also feels that Emma has carelessly "lost" track of Wither and constantly reminds her of the fact that Kevin is no longer in the school or under her surveillance.

[volume & issue needed] Mercury has also been deeply affected by the events of Decimation, as depicted in the "Endangered Species" miniseries.

[volume & issue needed] Mercury later comforts X-23 after she ran off and wrecked the woman's restroom in rage due to Surge kissing Hellion, and is later seen hanging out with her and Dust.

[volume & issue needed] Mercury is one of the New X-Men led by Surge that launch a strike against the Purifiers to incapacitate them and rescue the mutant baby.

After Hellion is critically wounded by Lady Deathstrike, Pixie panics and blindly teleports the entire team out of the Purifiers' base, spreading them out between Washington and New York.

[volume & issue needed] Cessily is among the several X-Men helping to fight off Skrulls during their invasion of San Francisco.

[3] Mercury engages Magik in combat and manages to stab her in the shoulder; Illyana responds by blowing her up, noting that she has some immunity to magic, but is not invulnerable.

[5] Mercury, along with fellow students Onyxx and Loa, was tasked with keeping peace at the riots on Telegraph Hill after the mutant-hate group "Humanity Now!"

[volume & issue needed] Believing that he is doing them a favor he attempts to kill Mr. Kincaid on live television only to be stopped by Domino.

Furthermore, in a New X-Men flashback during the Mercury Rising storyline it showed a concerned father discovering Cessily during the onset of her mutation.