Numeri acts as primary physician to the Witch of Delays. Her lavender and pink body evokes a sea cucumber, crowned by wavy dark purple hair. Turquoise eyes accentuate her face, detailed with pink lipstick and eyeshadow. She wears a green shirt beneath a white doctor's coat. A later conflict breaks her larger right horn.

Her personality blends a consistently laid-back demeanor with subtle tactical approaches in confrontations, often lacing her dialogue with sarcasm. Despite her antagonistic affiliation, she displays genuine care for fellow servants Chongire and Elda, sometimes adopting a motherly stance toward Elda.

Her medical duties serve the villainous hierarchy. Key narrative actions include:
- Bandaging Chongire's injured claw after a cooking mishap and taking over his Motivation Power gathering.
- Creating the totem pole Yaraneeda and becoming the first antagonist to witness Cure Flamingo's transformation.
- Identifying Laura as the Cures' ally and devising the plot to steal the Mermaid Aqua Pot.
- Offering emotional support and her emergency Motivation Power stash to Elda after Elda flees the mansion.
- Transforming her stethoscope into a combat Yaraneeda during the Cures' infiltration.
- Reacting with shock to the truth of the Fool's Casket and horror at Butler transforming Chongire into a Yaraneeda.
- Having her Motivation Power drained by the Butler Yaraneeda, recovering swiftly due to minimal reserves.
- Ultimately allying with Chongire and Elda against Butler, joining the Cures to battle kowasundas by launching tentacle attacks from her stethoscope.

Her combat abilities focus on manipulating medical equipment:
- Firing binding tentacles from her stethoscope to trip enemies.
- Summoning Yaraneedas by projecting dark energy at objects to steal human Motivation Power.

After the central conflict resolves, she practices as a doctor. She resides with Elda and Chongire in the ruins of the Witch's mansion, maintaining her presence in their lives.