Usada Hikaru, operating under the stage name Rabi~en~Rose, functions as a human rival to Dejiko within the Di Gi Charat universe. She vehemently prefers her alias over her birth name, Hikaru Usada. The stage name "Rabi~en~Rose" cleverly merges English ("rabbit"), French ("La Vie en Rose," evoking rosy optimism), and Japanese ("usagi/rabbit" via her surname), cementing her rabbit motif and cheerful persona. Physically, she stands 164 cm tall including signature purple heels, with rose-pink hair styled in twin pigtails featuring dice-shaped ornaments. Her rose-red eyes (temporarily blue in a 2007 redesign) complement oversized white rabbit ears and a cotton tail. She consistently wears a light pink waitress-style dress accented by ribbons. Born on August 30, 1985, the 14-year-old juggles junior high school with part-time jobs after her parents granted independence to pursue idolhood. Some iterations note French-Japanese heritage. She activates her bunnygirl idol form through dice rolls—a core trait distinguishing her from other kemonomimi characters, as she avoids animal-themed speech patterns. Her personality blends overt competitiveness and bossiness toward Dejiko with a hidden longing for friendship. This complexity surfaces in narratives like the Ohanami Special, where she risks her life to procure a cure for Dejiko’s illness, only to be met with ingratitude reigniting their feud. Across the franchise, her idol ambitions and turbulent dynamic with Dejiko remain central, appearing in *Summer Special 2000* during Piyoko’s debut and later interacting with an older Dejiko in *Winter Garden*, though specific role details and relationship evolutions are not elaborated.