Rikekuma is a teddy bear character sporting glasses, a lab coat, a student hat, and a pointer stick, creating an academic look. His presence is unacknowledged by other characters; he functions solely as an educational mascot addressing the audience directly. He appears between scenes or during transitions to deliver concise lectures on scientific concepts like the traveling salesman problem, data normalization, rounding of irrational numbers, margins of error, and null hypotheses, providing context for the main characters' research methodologies.

Typically exhibiting a grumpy and impatient demeanor, Rikekuma often expresses scorn toward human inefficiency or emotional problem-solving. This contrasts sharply with the main cast's enthusiasm. Despite his irritable nature, his explanations remain thorough, and his visual design retains an inherently cute aesthetic. He occasionally wears additional costumes or uses props during his lectures, unaware of his own comedic effect.

Rikekuma possesses no revealed background, origin story, or character development across any series iterations. His role is consistently limited to that of an educational intermediary without interactions affecting the plot or relationships. His narrative purpose is strictly expository, breaking the fourth wall solely to clarify scientific principles without participating in ongoing events.