Pegas operates as an indispensable support robot throughout multiple narrative iterations. Created by Professor Amachi (or Dr. Richardson in certain adaptations) during a three-year development period, it features artificial intelligence and verbal communication. Its core function involves transforming a human into an armored warrior using a specialized compartment, the "Setter Room," located within its legs. The transformed warrior emerges from a hatch on Pegas' back.

In combat, Pegas serves as the warrior's steed. Primary thrusters are integrated into its fingers, while its legs and hands maintain full functionality. Pegas can independently exit Earth's atmosphere, typically an emergency measure. It once received a special barrier coating for protection against the enemy Ganira.

During a critical incident involving severe system overuse by the warrior, Pegas performed an emergency medical procedure, pushing itself beyond operational limits and suffering significant damage. After extensive repairs and upgrades by its creator, it resumed duty with an enhanced transformation system.

Within the reimagined narrative, Pegas is a battle robot built by Levin (Maggie). Its primary purpose shifts to housing the shattered crystal shards of the warrior Blade, enabling his transformation after his original crystal's destruction. This version forges a close bond with Blade, actively engages in battles, and exhibits advanced AI characteristics.

During the climactic Moon confrontation, Pegas intercepts a fatal attack from the antagonist Omega meant for Blade. This sacrifice results in Pegas' complete destruction. Its final act is transmitting a farewell message to Blade. No concrete information exists regarding Pegas' appearance or role in OVAs, spin-offs, or other extended media.