Built by Dr. Polto as one of six advanced guardians for his son Robin after Robin's parents were forcibly abducted by invaders from Palta, Lobo is a combat-specialized robot. He wields dual guns with super-speed, exceptional agility, and unmatched aiming precision, serving as the team's primary offensive fighter and espionage specialist. Despite programming suggesting no emotional channels and a nihilistic design, Lobo consistently exhibits a full spectrum of human-like emotions, including joy, anger, sadness, and happiness.

A vital aspect of his functionality is transformation, allowing him to disguise himself as ordinary objects like trees or furniture or assume human-like appearances for infiltration into enemy operations or blending into everyday environments. This skill makes him invaluable for intelligence gathering and surprise attacks. Visually characterized by sunglasses, his personality is often cool, confident, and occasionally overconfident, sometimes leading to reckless decisions during missions.

Within the Rainbow Sentai team structure, Lobo frequently assumes frontline combat duties, leading charges against adversaries. His tactical mind positions him as an informal third-in-command, supporting Robin and the Professor. However, his assertive nature can cause friction, especially when his confidence results in complications requiring team intervention. His background remains rooted in his creation by Dr. Polto, and his role consistently focuses on providing combat strength, strategic offensive capabilities, and infiltration support to the team defending Earth.