The character first appeared in The Uncanny X-Men #528 (September 2010), in the third chapter of the "Five Lights" storyline, and was created by Matt Fraction and Kieron Gillen.

Temper first appeared in Uncanny X-Men #528 (September 2010) as newly manifested mutant who is deeply conflicted about her powers.

[4] When deciding not to be called "The Girl Who Wouldn't Burn," Idie describes herself as "a witch child," "a blasphemy," and "a heretic."

During a visit from Deathlok to the Jean Grey School of Higher Learning, it is suggested that Idie has a high probability of eventually becoming leader of the X-Men.

[13] Idie was one of many mutants who moved to Krakoa when it became an independent nation, and was one of the former Xavier Institute students living at the Akademos Habitat.

[14] She became involved with Nekra and when the two killed a bunch of mercenaries who were invading the island by sea, they were sentenced to the Pit of Exile for breaking the "murder no man" law.

[16] Victor began working on a plan for them to escape the pit by channeling their consciousnesses through the island so they could manifest themselves on land.

[17] When a fight between Sabretooth and Melter almost kills everyone in the pit, Nekra and Idie are saved when Third-Eye drags their consciousnesses to the astral plane while Krakoa fixes their bodies.

[19] The team tracked Sabretooth to Noble Island, which she and Nekra were horrified to discover was a dumping ground for the bodies of mutants experimented on by Orchis.

After fighting a super-powered Orchis agent named “The Creation” and losing Orphan-Maker, Sabretooth came on a boat and smugly offered them a ride.

[20] Forming an uneasy alliance with Creed the team infiltrated Orchis Station Two where Orphan-Maker was being held prisoner, alongside hundreds of other Mutants.

[22] The team escapes with the freed Orchis prisoners on their boat which Maddison used debris from the destroyed base to turn into a vessel big enough to contain them all.

Sabretooth decides to enact one last plan for revenge against the Quiet Council by turning all the young mutant prisoners against Krakoa, he is interrupted when the team arrive at the final, underwater Orchis base and are hit by a tidal wave.

The rest of the team, alongside Dr. Barrington and her creation are trapped in the base with the kids who instinctively attack them out of fear that they're there to perform more experiments.

This power allows her to move heat from one area to another, producing various effects, as well as rendering her body completely immune to temperature extremes.