Chibi Biollante is a diminutive plant-based kaiju whose appearance is inspired by the classic monster Biollante, adapted into the simplified and adorable style of the chibi aesthetic. Her physical form is a hybrid of plant and animal traits, featuring a verdant body adorned with trailing vines tipped by small, snapping mouths, jagged dorsal spines, and a vivid rose blooming prominently on her abdomen.

Within the context of the anime, Chibi Biollante presides over a bar or tavern situated on Monster Island, serving as an anchoring figure amidst the often chaotic energy of her fellow chibi kaiju. Her personality stands in stark contrast to the island's typical antics; she speaks with an air of archaic elegance and poetic flourishes, maintaining a refined and composed demeanor. This quiet authority allows her to deftly navigate disputes among patrons, and she often acts as a mediator and a composed observer during the lighthearted clashes that occur.

Her role in the story is that of a stable, enigmatic secondary figure within the ensemble cast. While her identity as a younger iteration of Biollante is hinted at through her genetic lineage and botanical abilities, the explicit ties to the original character's tragic origins from the live-action films are left undefined. She participates in the episodic escapades on Monster Island alongside other characters such as Chibi Godzilla and Chibi Mechagodzilla, typically displaying measured cooperation and a dry wit. Her motivations and inner drives remain largely veiled, as she functions as a consistent and stabilizing fixture in the island's lively microcosm rather than a character driven by a personal arc. Her portrayal is characterized by consistency, and she endures as a whimsical yet composed presence whose demeanor and purpose remain unchanging. Her notable abilities are tied to her plant-based physiology, though the focus remains on her role as a composed mediator and bar owner rather than on displays of combat prowess.