Kirimaru Settsuno, an orphan from Settsu Province, lost his family and home to war in early childhood, leaving him without a surname. Surviving through various part-time jobs like battlefield lunchbox sales, he developed exceptional resourcefulness and street smarts. He independently funded his Ninjutsu Academy entrance through part-time work and continues juggling multiple jobs to cover expenses, earning the nickname "Genius Part-timer." He has dark violet or blue ponytailed hair, sharp upturned eyes, a pointed tooth, and always wears a navy scarf. His eyes shift to coin shapes at the mention of money, reflecting his wealth obsession. Kirimaru exhibits extreme stinginess, prioritizing money over nearly everything—even claiming it surpasses his life in importance. Terms like "free" excite him, while "loss" causes distress. Yet beneath this lies compassion; he occasionally helps those in need if their struggles mirror his past, stating, "I just thought, if I can help, I should." His skills include exceptional agility, ninjutsu fundamentals, and rapid mental calculations—especially with currency. He possesses superhuman hearing for coin-related sounds, identifying real coins by jingle or scent from great distances. A notable weakness is his inability to release grasped objects, extending to always choosing "rock" in rock-paper-scissors. He adeptly cross-dresses for certain jobs, often praised for his convincing appearance. At the academy, Kirimaru is in first-year Ha class and serves on the Library Committee. During breaks, he lives with his guardian and homeroom teacher, Hansuke Doi; their bond stems from shared backgrounds as Settsu war orphans. Kirimaru maintains close friendships with classmates Rantarou Inadera and Shinbei Fukutomi. This trio of underachievers supports each other academically and in adventures, with Rantarou affectionately calling him "Kiri-chan." He respects senior Nagano Chouji, who assists with school fees, and idolizes Granny Orin’s frugality as his thrift mentor. In various storylines, Kirimaru reveals vulnerability under his cheerful facade. When Doi-sensei disappears, he privately cries beneath blankets while maintaining composure around friends. His tragic past surfaces in reflections, like noting his village might have survived with better defenses. During missions, greed drives actions—such as sprinting past valuable scrolls for a single coin—yet he demonstrates loyalty by aiding plans that protect the academy from threats like Dokutake Castle. His backstory and resourcefulness prove vital in team strategies, particularly money-related schemes. He cross-dresses in several stories for financial gain, sometimes surprising others with his appearance. His development includes balancing profit-driven motives with selfless acts, like aiding strangers or risking himself for friends, signaling growth beyond survival and wealth.