Gai Daido pilots heavy-duty formations for NASAR (or NISAR), specifically Neo Getter-3. His imposing physique combines muscularity with noticeable obesity, complemented by short black hair in a crew cut. He wears a green uniform inspired by classic Getter Robo designs.

Originally a NASAR mechanic, Gai mastered the Neo Getter Machines' memory-alloy framework and transformation mechanics. This expertise, paired with his ability to diagnose mechanical issues through auditory and vibrational cues, propelled him to pilot status during the Dinosaur Empire's resurgence. He joined Hayato Jin's Neo Getter Team alongside Go Ichimonji and Sho Tachibana.

Friendly yet serious, Gai maintains emotional stability that anchors team dynamics. He mediates between Go's impulsiveness and Sho's calculated approach, fostering cohesion. Despite his affability, he displays resolute toughness when defending colleagues. His profound reverence for Getter Robo earned him the moniker "Getter Lover."

Commanding Neo Getter-3 (Neo Bear)—a black, tread-equipped form for aquatic and heavy combat—he deploys weapons like Getter Tornado and the plasma-lightning attack Plasma Break from dorsal spikes. Off-duty, his substantial appetite builds rapport with restaurateurs, turning these connections into intelligence networks.

In extended lore, Gai served as a Getter Robo Go mechanic at Alaska Base. During a Metal Beast assault, he jury-rigged damaged systems into Getter Gai, demonstrating piloting resourcefulness that secured his role as third pilot. Later, Shin Getter Robo's Getter Ray exposure briefly shattered his sanity, driving him to sabotage the machine before assimilation granted transcendent understanding of Getter energy.

He holds steadfast loyalty to Sho Tachibana, crediting him with saving his life, and regards Hayato Jin as a mentor inheriting the original Getter Team's legacy. His approachable nature cultivates a broad web of contacts.