I am Jahy, the Dark Lord's right hand, and the second most powerful being in the Dark Realm!
The protagonist of Jahy-sama wa Kujikenai! (localised as "The Great Jahy Will Not Be Defeated!"), who alternates between an adult and child-like form due to circumstances.
Her hair is a blackish/dark blue colour in official illustrations, but in the anime it is a more saturated purple.
Voiced by Oozora Naomi in the anime adaption.