Momo Usa, meaning Peach Bunny or Pink Bunny, debuted in 2007 within the Sugarbunnies universe alongside her twin sister Hanausa. She appears as a pink-furred bunny character consistently adorned with a pink ribbon. In their homeland of Bunniesfield, Momo Usa works as a florist with Hanausa, cultivating, nurturing, and arranging flowers. Her role grants her the unique skill to detect and identify specific flower varieties solely by scent.

Personality-wise, Momo Usa displays a marked interest in aesthetics, known throughout her community for exceptional fashion sense and design skills. She regularly offers fashion advice, cementing her status as the resident style authority among the bunnies. An additional character element notes her romantic interest in Kurousa, a bunny specializing in pastries.

Transported from Bunniesfield to the human world, Momo Usa lives with Sophia Cherbourg alongside the other Sugarbunnies. The bunnies initially maintain secrecy by posing as inanimate plush toys around humans. Momo Usa experiences a significant incident where Catherine, Francoise Dupont's pet dog, mistakes her for an actual plush toy, requiring Sophia's intervention to create a replacement plush for her release.

During their time in the human village, Momo Usa and Hanausa contribute their floral expertise to community activities. Their appreciated bouquets become integrated into local life, with the sisters' flower arrangements becoming a feature of the village during their Earth stay.