Bell is a supporting character from the anime Rainbow Sentai Robin. She is a cybernetic or robotic entity designed with the appearance of a cat. Her primary function within the team is to serve as a mobile radar and sensory unit. Bell is equipped with powerful detection abilities that allow her to monitor the surrounding area for enemy movements and potential threats. In addition to her passive radar capabilities, she can also actively scramble enemy radar and communication signals, providing a tactical advantage by confusing or blinding hostile forces.

As a member of the team of robots created to assist the protagonist Robin, Bell plays a dedicated role in support and reconnaissance. She is often seen working in conjunction with the other robotic members, and her small size allows her to ride in a special compartment in the chest of the strongman robot Benkei. Personality-wise, Bell is portrayed as having a gentle, meek, and shy demeanor. She is notably timid and often becomes the target of teasing or harsh comments from another team member, the Professor, which establishes a dynamic of comic relief between the two characters. Despite this friction, she remains a loyal and effective member of the Rainbow Sentai. Her notable abilities are almost entirely focused on electronic warfare and detection, making her the team's expert in radar-based tactics rather than direct physical combat.