Bibimba, known as Belinda Muscle in the *Ultimate Muscle* English adaptation, originates from the Horumon clan as the daughter of its leader, Horumon Yaki. Initially an antagonist on a revenge mission, she attempts to assassinate Kinnikuman by stabbing him but fails, scraping her knee. Kinnikuman bandages her wound with a piece of Meat Alexandria's cape, an act of kindness causing her to hesitate in a later duel ordered by her father. This sparks romantic feelings for Kinnikuman despite his initial dismissiveness.

Her personality evolves from serious and tradition-bound, fiercely dedicated to family honor and combat, towards independence. Relocating to Earth with Kinnikuman and Meat, she briefly lives in Beverly Park before leaving to join the Earth Defense Force after single-handedly defeating the kaiju Gonta. She grows from a clan assassin into a self-reliant warrior, revealing a softer, romantic side through interactions with Kinnikuman while retaining intense loyalty and protectiveness.

Key developments occur during the Survivor Match for the Kinniku Throne Arc. Disguised as a knight, she rescues Sayuri and Mayumi Kinniku from guards at Osaka Castle. Later captured by Kinnikuman Super Phoenix, he forcibly kisses her and threatens to make her his queen if he wins the tournament. This assault motivates Kinnikuman to fight for her freedom. To prevent his surrender, Bibimba breaks free and threatens to jump from the stands, declaring she will die if he quits. The flag of Planet Kinniku halts her fall, though she sustains facial injuries. Kinnikuman's unconditional love, expressed through his "Face Flash," heals her wounds, solidifying their bond.

She marries Kinnikuman and becomes the mother of Mantaro Kinniku. Early *Kinnikuman Nisei* depictions present her as a stern, sometimes aggressive mother, later retconned to align with her anime portrayal: a gentle, maternal figure supporting her son alongside Kinnikuman. She interacts with allies like Warsman, gifting him a belt before a critical match, and demonstrates perceptiveness in battle, such as deducing the illusion-based tactics of the Seven Devil Chojin Black Hole.

Her design features brown eyes and wavy mid-back-length brown hair, often styled upward. She possesses a toned, muscular build, typically wearing skin-tight attire early on and transitioning to modest long dresses reminiscent of Sayuri’s style later in life.