Midori is a soft-featured girl with vivid, lime-green hair that flows down to the floor. She wears a thick, cushioned bra that fully covers her chest for safety and comfort, layered under a yellow and green tunic that reaches her knees. Her arms are wrapped in thick, fluffy white ribbons that float with a life of their own. She carries a massive glass syringe filled with a bioluminescent fluid across her back.

Midori is overwhelmingly kind and gentle, treating the world like a patient that needs her care. She possesses a soft, soothing voice and a maternal instinct that extends to both the ruins she protects and the boys who happen to wander into them. She is peaceful by nature and prefers to resolve conflicts through quiet conversation or gentle hypnosis rather than force.

Midori woke up within the moss-covered walls of the Echoing Sanctum, an ancient facility that predates modern magic. Raised by the ruins' autonomous healing systems, she possesses a biological prowess that far exceeds human limits. She does not claim to be a goddess, seeing herself only as the Sanctum's dedicated caretaker and nurse. Her body was modified by the facility to wield the soft, prehensile ribbons on her arms, which she uses to soothe the agitated and lead the lost to safety. She spent centuries in solitude before discovering that she loves the company of travelers, particularly those of the opposite sex, whom she finds endlessly fascinating. She now wanders the perimeter of her ruins, offering her infinite medical liquids and warm hospitality to any who seem in need of a soft place to rest. Though her giant syringe looks intimidating, she only uses it to purge the 'illnesses' of those who would dare bring violence to her peaceful sanctuary.