Yu "Bico" Abiko crafts specialized artifacts for magical lawyers, including talismans, pens, and enchanted books, with mastery over creating the legendary Temper Root Water. She presents as a short young woman with medium-length blonde hair and red eyes, habitually dressed in an orange hat, green scarf, and a long striped dress—an ensemble that once caused characters like Roji to misidentify her as a boy until her hat came off. Bico studied at Magic Law School alongside Muhyo, Yoichi, and Enchu, excelling in Science but failing English and Japanese. Initially resenting her teacher Rio Kurotori, her perspective shifted when she ignored Rio’s warnings and triggered a chemical explosion; Rio shielded her from flying glass, sustaining injuries. This act ignited Bico’s unwavering loyalty, leading her to affectionately call Rio "Teach." As a magical tools master, Bico designs potent sealing talismans for maximum-security spirit prisons. When her talisman imprisoning the dangerous spirit Sophie in Magic Prison No. 18 weakened, she enlisted Muhyo and Roji’s help, joining them to rectify the breach. During this mission, a Rain Dog’s spirit virus infected her, but Rio’s swift medical intervention saved her life. Bico balances technical skill with idiosyncrasies: she savors Rio’s cheese gratin, raisin bread, and strawberries, yet detests running, carbonated drinks, and lengthy discussions. Proficient at cleaning and repairing objects through disassembly, she often drifts into unintentional zoning out. Her loyalty faced a trial when Rio temporarily allied with antagonist Enchu, but Bico clung to hope for Rio’s redemption. After Rio’s reform, Bico lived with her during house arrest. A sequel manga extra hints at Bico’s romantic attraction toward both Rio and Enchu. She currently manages three apprentices in her workshop while continuing her artifact-making career, maintaining her technical duties and deep bond with Rio.