Ikazuchi, originally Bolt Fuchigami, was born into the Fuchigami Clan, guardians of the seal imprisoning the planet-consuming entity Yamigedo. His early life, though filled with familial love, was bound by strict traditions limiting his freedom. The First Knight of the Apocalypse, Gratos, manipulated him by impersonating an Omni Lord and warping the clan's behavior. Tricking a young Ikazuchi into removing talismans from a rock, Gratos caused him to unknowingly shatter Yamigedo's seal. This act instantly petrified his entire clan. Gratos implanted false memories, making Ikazuchi believe he had deliberately unleashed Yamigedo as revenge for fabricated abuse, erasing his true, content past. Fragments of his suppressed memories surfaced as dreams. Assuming the name Ikazuchi ("thunder"), he became Yamigedo's human partner and spearheaded the Hundred Demons invasion. Yamigedo's influence twisted his appearance, granting him lightning-bolt pupils, sharp fangs, claws, purple skin tones, and red markings beneath his eyes. He wore a distinctive white coat and claw-like belt, wielding lightning-emitting rings. His personality turned sadistic and arrogant; he punished failures like Magoroku Shido's with electrocution. Obsessed with consuming Earth, he targeted powerful entities like the Omni Lords, defeating Tenbu and Gao Mikado using Yamigedo's Thunder Mine abilities and his signature "Unorthodox Arts, Shoraiabare Kandachi" technique. His powers included flight via cape-like wings, lightning manipulation, summoning Hundred Demons through the chant: "Awaken! Power of Darkness! Power of Evil!! Power of the Hundred Demons!!!", and memory extraction/consumption. His vendetta against the Fuchigami Clan stemmed solely from these implanted memories of oppression. After Yamigedo consumed Tenbu, power incontinence forced his inactivity. Surviving a cave collapse during a rematch with Gao left him weakened. Gao's mother subdued him, and he experienced unexpected kindness in the Mikado household. There, he discovered discrepancies in his memories; Drum Bunker Dragon confirmed no physical scars existed on his back. Gratos later exposed the manipulation, triggering a mental breakdown. Learning Gratos planned to sacrifice him to Yamigedo, Ikazuchi shifted his goal to revenge against Gratos. He assisted the heroes in resealing Yamigedo, achieved his revenge against Gratos, and underwent a Heel–Face Turn. His bond with Yamigedo manifested a heroic counterpart opposing the original entity. Later, he participated in tournaments like the GGG Cup, wielding a reformed Parade of Hundred Demons deck centered on Thunder Mine mechanics alongside his true partner, now evolved into Heavenly Specter, Yamigedo Mikazuchi. His rivalry with Gao continued through friendly competitions. Ikazuchi's powers derived from Yamigedo encompassed physical enhancement, lightning generation/teleportation, and flight. His memory consumption ability erased specific memories by consuming memory orbs. His card deck utilized Thunder Mine effects, countering opponent actions with variable damage or penalties.