King Suguru Kinniku, prince of Planet Kinniku, was left on Earth as an infant when his parents, mistaking him for a pig during a vacation, accidentally abandoned him. Growing up isolated, he faced academic failures and grueling labor before pursuing superheroism—a path marred by his awkwardness and naivety. A turning point arrived upon learning his royal lineage, propelling him into professional wrestling. There, he claimed victory in two Chojin Olympics, cementing his reputation as a formidable warrior and ascending as the 58th ruler of his home planet.

His marriage to Bibimba, a once-lethal assassin softened by his compassion, brought their son Mantaro into the world. As age eroded his once-powerful physique, leaving him with a paunch and diminished strength, his mastery of wrestling techniques and submission holds endured. To protect Mantaro from the weight of legacy, he erased all traces of his heroic exploits, masquerading as a jovial, unremarkable parent. This deception led Mantaro to dismiss his heritage until new dangers arose, compelling Suguru to step reluctantly into mentorship.

Though prone to comedic antics, flashes of tactical genius and tenacity surfaced, often fueled by his "Burning Inner Strength" ability. Bonds with allies like Terryman, a steadfast friend and tag-team companion, and Robin Mask, a reformed rival, highlighted his loyalty and personal growth. Removing his royal mask—an act forbidden by his lineage—unveiled both concealed charisma and potent restorative energies, though at great personal risk.

In later life, he oscillated between lighthearted self-mockery and earnest paternal worry, haunted by past battles while confronting their lingering scars. His dual identity as a seasoned monarch and aging father remained intertwined, each role shaping his enduring legacy as a warrior-king navigating the trials of time and parenthood.