Throughout her comic career, Emma hasn't just been redeemed since, but has even gained a secondary mutation that makes her even more powerful than the mighty psychic she used to be. Surprisingly, there's a codename lurking in Emma's past that's perfect for her current power set and outlook.
Originally an aristocratic villain, the genocide of the mutant nation of Genosha triggered both her secondary mutation and a reluctant turn to the side of the angels. As well as telepathic powers, Emma gained the ability to shift her skin into a diamond-like substance, quickly adopting a leadership role with the X-Men which has persisted to modern-day Krakoa - a mutant nation ruled by the Quiet Council, on which Emma has secured herself a seat. While caring deeply for young mutants, Emma affects an air of regal disdain for those around her, but fans have seen enough of her inner life to know for sure that she has the heart of a hero.
However, that wasn't always apparent. In Astonishing X-Men #16 - from Joss Whedon and John Cassaday - Emma is seemingly the member of a cabal of villainous mutants who ambush the team within Xavier's Mansion. Ultimately, it turns out that Emma is being preyed on by the telepathic parasite Cassandra Nova, and that each member of the group is just a psychic projection. This is even the case for the group's apparent leader - a mysterious robed figure referred to as 'Perfection,' who is eventually revealed as Emma's concept of herself as a dangerous villain.
Despite the traumatic origin of the name 'Perfection,' Emma should really consider reclaiming it as her mutant name. Both Emma's actual name and her White Queen persona were cooked up back when she was merely a powerful telepath, but her diamond skin has now become an iconic part of the character. 'Perfection' is descriptive of both her powers and her aristocratic attitude in a way no other codename has been, and is totally within Emma's character to adopt as a term others would then have to call her.
With the Krakoa Era now thoroughly underway, mutant names have never been more important, since they have actual cultural value in separating mutant culture from the human world. As a member of the Quiet Council, it would make sense for Emma to adopt a mutant name like the majority of Krakoa's citizens, and her White Queen persona is if anything even more steeped in past villainy than 'Perfection.'
Strongly associated with the striking visual of her diamond powers in modern comics, and having thoroughly embraced redemption over many years of stories, Emma Frost has more than earned an impressive superhero codename, and while it only appeared for a few issues back in 2006, X-Men already gave her the perfect one with 'Perfection.'
