Memento Mori is a wood-elemental War God of female gender, thousands of years old, possessing genius intellect, vast battle experience, and profound strategic prowess. She has grey hair and can alter her form through transformation and cloth manipulation. In her evolved state, her combat capabilities intensify, marked by 22,165 health points, an attack power of 24,266 when employing her gauge ability, and a speed stat of 307.22. Her skills include Null Warp, Water Resistance, and Vivolith Slayer, with a unique gauge function that augments her attack and reduces strike shot turn counts.

Her offensive arsenal features an eight-way large elemental laser as a bump combo and a targeted poison pulse strike shot. She wields superhuman physical traits, energy projection and absorption, gravity manipulation, poison control, and amplified durability. She creates and negates portals, manipulates elements, and generates protective fields. She further employs mind manipulation via illusions, memory distortion, and empathic influence to heighten human obsessions. Additional powers encompass dimensional travel, dimensional BFR, pocket reality manipulation, duplication, power mimicry, and danmaku assaults.

She exhibits extensive resistances to water-based attacks, extreme heat and fire, gravity manipulation, atomic destruction, air manipulation, durability negation, corrosion, regeneration nullification, absolute zero, radiation, sound manipulation, poison, acid, magic, space-time manipulation, deconstruction, and existence erasure.

Within her narrative role as an antagonist, she acts with manipulative intent, specifically toward a character named Haruma. She distorts his memories and possesses him, compelling conflict with his allies, driven by her capacity to amplify human emotions, particularly obsession. A noted vulnerability to fire-based attacks stems from her wood-elemental nature.