Rai Fudatsuki is a charismatic and ambitious second-year student at Kamikazari Middle School, holding the position of student council president. He operates an illegal casino named "Reasonable Doubt" and maintains professional connections with a private weapons manufacturing company, evaluating their products. His appearance features pink hair styled to ear length and pink eyes, frequently depicted wearing a suit, gloves, and carrying a suitcase. The character appears in the collaborative narrative "Mazemonogatari," intersecting with the Monogatari series, where his established traits and activities remain consistent.