Ryūgo Hijikata roams the streets as a delinquent brawler, his muscular frame and sun-bronzed skin contrasting with a shock of bleached yellow hair. Clad in a long black gakuran and Shōwa-era biker pants, he embodies retro rebellion. A thunderous laugh and thirst for combat mask a tender core, driving him to shield friends, children, and the elderly from harm. His fierce loyalty centers on Minae, director of the Sunflower Garden nursery he calls home—a non-blood maternal anchor steadying his turbulent spirit.

Scarred by childhood maternal abuse, including prolonged confinement in darkened closets, these wounds explode during a brutal skirmish, fracturing his psyche. Fleeing the nursery to sever ties, Minae intercepts his retreat, cementing their kinship with unwavering resolve. This confrontation forces him to merge fractured identities, embracing the found family that anchors him.

Drafted as the Musashi mecha’s co-pilot, his close-quarters mastery syncs with the Gaudia Megaton-Class Rogue—a juggernaut prioritizing brute-force combat and unyielding defense. While his brawling instincts dominate battles, emotional turmoil sometimes fractures his focus mid-conflict. Growth tempers his rage into purpose: once a hotheaded instigator, he evolves into a disciplined guardian channeling strength to protect others. This transformation, fueled by reckoning with buried anguish and deepening bonds, intertwines with rivalry-laced camaraderie alongside co-pilot Yamato, underscoring his duality as both battlefield asset and layered survivor navigating vulnerability beneath a hardened shell.