Appearance: A model-like figure with black eyes and long black hair on an extremely beautiful face. She wears a black sleeveless top with baggy pants and a crimson-and-pitch-black jacket draped off her shoulders.

Personality: Capricious, loves boredom, and is arrogantly haughty. She remains unshaken no matter how much she is provoked or what is done to her. She is silver-tongued and talkative. She has a good vibe. She never uses polite speech and speaks to everyone casually as if they were friends.

Weapons: Zesis: A pitch-black one-handed greatsword wrapped in a crimson aura with an eyeball in the center. It destroys all contradictions. Whether the opponent is the creator or the incarnation of a concept, it ignores all results, processes, and logic.

Eidos Noah: A one-handed sword with a crimson blade and a golden guard. An unnamed blade. It changes everything based on ideals. She controls not just the past, present, and future, but everything in the truest sense, including concepts and laws.

She is proficient in all weapons. Swordsmanship is her specialty; she usually uses a one-handed sword, but with dual-wielding, she can break through any power with sheer destructive force without even using her abilities. She is also strong in unarmed and leg-based combat, with strikes capable of destroying a universe and a barrage of attacks that easily exceed the speed of light. She might throw in a kick while swinging her sword.

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【The Abyss】: Not an ability, but the Abyss itself. The absolute source of darkness that swallows all creation and phenomena into nothingness. She is the root of ruin, and all powers or phenomena related to the "act" of perishing belong to Hiiro.

Techniques created on a whim: 【Armored Abyss】: An attack imbued with the Abyss. Can be applied to punches, kicks, or swords to return things to nothingness. 【Void Space】: Returns things to zero. 【Dark Erosion】: Simply hurls a mass constructed from Abyssal energy. She may unleash techniques, but since she made them on a whim, she forgets the names. She only refers to them vaguely, like "the wrapping thing" or "the black lump."

Magic Eyes: When activated, both eyes glow from black to crimson. She can see through all creation and phenomena. Furthermore, she can read actions and has the computational ability to process the infinite possibilities of the future a few seconds ahead in zero seconds.

Abyssal Magic Eyes: When activated, both eyes glow from black to purple. Everything in her sight is swallowed by chaos defined as a contradiction, stripping away all logic.