Quentin Quire

Young Quentin Quire was one of the top students at the Xavier Institute for Higher Learning, having been inspired by Professor Charles Xavier's dream of human/mutant brotherhood when he was 13 years old. Among his achievements, Quentin created a set of anti-gravity floats to grant mobility to the disembodied brain of his fellow student Martha Johansson. Devastated after learning that he was adopted, Quentin was pushed over the edge following the death of renowned mutant fashion designer Jumbo Carnation, supposedly at the hands of humans. He began to doubt Xavier's teachings, and developed a more negative and hostile view of the world and of humankind.

Quentin became addicted to the new designer drug "Kick," which increased superhuman mutant powers but also altered the brain's metabolism. Quentin assembled a group of others that shared his beliefs about humans, calling them the Omega Gang, and set about attacking both innocent humans and members of the mutant-harvesting U-Men group alike. Creating a helmet patterned after that worn by Magneto which prevented the use of telepathic powers, Quentin and the Omega Gang captured Xavier during an Open Day at the Institute and fomented a student riot. While the X-Men easily defeated the Omega Gang, the identical telepathic quintet named the Stepford Cuckoos sought to oppose Quentin. One of the Cuckoos, Sophie, whom Quentin was besotted with (much to her chagrin), empowered her sisters by taking a dose of "Kick" and utilizing the X-Men's mutant-locating device Cerebra to magnify their telepathic powers to a level higher than Quentin's. Defeating him, the strain seemingly proved too much for Sophie and she died.

Due to his abuse of "Kick," Quentin underwent a secondary mutation that caused his physical form to discorporate, leaving him a disembodied mind trapped in a containment unit. Later, when the cosmic avatar known as the Phoenix Force returned to Earth, its presence influenced Quentin to reconstitute himself. Creating a new physical form, he sought out his beloved Sophie. Remembering her death, Quentin exhumed her corpse and sought out the Phoenix Force to help resurrect her. The X-Men were able to trap the Force, but Quentin sought to free it and opposed the X-Men. During the clash, the Force was freed and it granted Quentin's wish, resurrecting Sophie. However, upon seeing Quentin, a disgusted Sophie chose instead to return to death. The Force ultimately merged with Jean and left, after which the heartbroken Quentin returned to his disembodied state.

Quentin was one of the countless mutants who joined the mutant-only nation of Krakoa established by Charles Xavier and his allies, where he grew a habit of boasting his superiority as an Omega-level mutant. Quire also joined X-Force after teaming up with Wolverine to investigate the murder of Xavier at the hands of a hate group augmented by the DNA of Domino, and rescued her in the process of thwarting the group's operations.

During X-Force's continued efforts against this mutant-hating group, Quentin died when a Krakoan gateway was exploded while he was passing through it, with the disrupted teleportation resulting in Quire's decapitation. After this incident, Quentin was brought back to life using the Krakoan resurrection process of the Five. Another mission involving diplomatic operations with Terra Verde saw X-Force confront the nation consumed by telefloronics, an out-of-control plant-based technology.[33] Quentin died in action again when he was overcome with telefloronic spores, but the Five's resurrection process saw him returned to life again. However, Quentin was killed again shortly afterward by a Russian infiltrator, who stabbed Quentin with the Cerebro Sword and pushed him into a gateway to land at the feet of Mikhail Rasputin, who intended to use Quentin's body for genetic experimentations.