Mikuru Katsuhara, known as Micchon to acquaintances and Mi-tan to Akira Takizawa, is a computer programmer vital to the Eden of the East group. She created the core image recognition software enabling object and individual identification via social networks, cementing her foundational role.

Her appearance features brown hair and brown eyes, typically held by a pink hair clip. She wears a distinctive outfit: a white "earth"-labeled shirt with blue sleeves, dark blue or purple jean shorts, dark pink tights or stockings, and white boots, sometimes adding a blue coat.

Around strangers, Mikuru exhibits shyness and reserve, but among trusted colleagues she is open and frank. Her default expression often seems bored or emotionally flat, though she flusters easily. She is notably protective of her laptop, handling it carefully and hesitating to let others near it.

During the events of *Paradise Lost*, Mikuru participated in critical Eden operations. She assisted in locating and intercepting mobile command units housing the Juiz AI systems. Her direct contributions included helping commandeer transport trailers containing the Juiz units for Seleção numbers 1 and 9 to prevent their destruction.

Her professional relationship with fellow Eden member Yutaka Itazu involves mutual respect for technical abilities. Observational records note frequent interactions suggesting possible romantic interest, including Itazu expressing liking toward her and her displaying anger toward him during communications.

As government authorities investigated Eden, Mikuru remained engaged in maintaining system functionality and supporting group objectives, consistently aligning her actions with Eden's mission to provide logistical and informational support.

Her surname combines "arrowroot" (葛, *katsu*) and "field, plain" (原, *hara*).