Mihari Oyama

Mihari Oyama (緒山 みはり, Oyama Mihari) is the child prodigy younger sister of Mahiro Oyama. Having skipped ahead several grades to go to college, she developed a drug that turned her older brother into a middle-school aged girl as part of her "Onii-chan Rehabilitation Project". She is voiced by Kaori Ishihara in the anime.

Appearance
Mihari is a high-school aged girl with a very athletic and trim figure. She has dark brown hair that is tied up in the back with a red bows forming long stranded pigtails (in the anime, these pigtails also contain purple streaks). She also has additional stands running along the sides of her face and bangs, the middle bang containing a gold hairclip that was once given to her by Mahiro during her first year of middle school as a reward for doing well on a test.

She is almost always seen wearing a signature red button-up top and brown skirt with a brown belt around her waist and a gold medallion around her neck. She also almost always wears a white lab coat on top of her outfit wherever she goes, regardless of the social situation.

Despite having outgrown her middle school uniform, it is shown that she is still small enough to just barely fit into it, indicating that she hasn't grown much since then.

Etymology

 * The name Mihari (みはり) means "fruit" (み) (mi) and "needle" (はり) (hari).
 * The name Oyama (緒山) means "string" ((緒) (o) and "mountain" (山) (yama).

Anime

 * Mahiro's Confusing New Body
 * Mahiro's Time of the Month