Shuichi Iguchi, alias Spinner, exhibits a bright green scaled, reptilian visage with a lizard-like face and swept-back pinkish-purple hair. He initially wore a costume meticulously modeled after his idol Stain: a sleeveless shirt, baggy pants, metallic knee guards, bandaged arms, a white cloth mask, goggles, and a large sword formed from multiple blades. During the Final War, after receiving the Body Bulk and Scalemail Quirks from All For One, his size surged dramatically, his scales darkened, his demeanor grew more animalistic, and he wielded an even larger reconstructed sword. Extensive scarring marked his body post-war from these transformations. Lifelong discrimination due to his mutant form carved hollow spaces within Spinner, leaving him adrift until Stain's ideology offered purpose. This drove him into the League of Villains to purge "false heroes." He adhered rigidly to Stain's code, sparing Izuku Midoriya because Stain deemed him worthy, yet voiced dissent when League actions like attacking police convoys strayed from it. His loyalty gradually pivoted from Stain to Tomura Shigaraki, forged through shared abandonment and video games. This devotion became absolute: he guarded Tomura's recovering body, defied All For One's control over Tomura, and accepted painful Quirk augmentations solely to remain useful. Forced into a symbol for oppressed heteromorphs, he embraced the role only for Tomura's cause, despite personal turmoil. After Tomura's death, profound grief consumed Spinner, who called Tomura his "first friend" and "hero." He channeled this into writing a book to preserve the League's legacy. His core ability stems from his Gecko Quirk, granting reptilian traits including enhanced climbing. A competent but not exceptional fighter, he relies on swordsmanship and tactical observation. He held his own against Pro Hero Mandalay during the Forest Training Camp Arc until distraction broke his focus. Augmentation via All For One's Body Bulk Quirk massively increased his size, strength, durability, and leaping power, while Scalemail enhanced his defense and agility. These transformations empowered him to battle multiple foes and withstand assaults from heroes like Mezo Shoji and Present Mic, though they eroded his mental stability. Key relationships defined his path. Stain ignited his villainous journey, though reverence faded as he aligned with Tomura. Within the League, mutual respect existed with Mr. Compress and Himiko Toga; after Twice's death, he pleaded with Toga to prioritize their "family." His dynamic with Dabi involved frequent mockery underpinned by respect for Dabi's resolve. His bond with Tomura deepened through shared vulnerability; he served as Tomura's bodyguard, confronted All For One possessing Tomura, and undertook vital missions like retrieving Kurogiri for the Final War. Post-war, Izuku Midoriya delivered Tomura's final message to Spinner, facilitating a cathartic acknowledgment of their connection. Spinner's story ended in arrest and hospitalization. Scarred and reflective, he vowed to document Tomura's life and the League's impact, ensuring remembrance beyond villainy. He also encouraged Izuku to support Mezo Shoji, implying a nuanced recognition of heteromorph struggles.