She's the daughter of Dyspear, the villain who rocks the black mask and plays violin. Goes by the Princess of Despair, which honestly fits the whole dark aesthetic. She's got fire powers and carries around a black Dress-Up Key that she uses to amp up the Zetsuborgs—basically slots it into one of the Three Musketeers' locks to juice up their strength.
Content compiled by AnimeList.moe from publicly available sources.
