The gifted doctor of the Going Merry and native of Drum Island, he was recruited by Luffy after the Straw Hats freed his snowy homeland from King Wapol's tyrannical rule. Ostracized by his herd for having a blue nose and hunted by humans as a beast after eating a Devil Fruit, he found acceptance only through the eccentric Dr. Hiriluk and Dr. Kureha. Carrying deep sorrow over Hiriluk's passing, he holds an unshakeable fear of isolation and dreads being judged as an unnatural monster. Naive, sweet, and easily frightened, he tends to hide backward behind walls and is completely captivated by tall tales and ninja tricks. As the youngest member aboard, he views the Straw Hats as his protective family and mirrors their behavior. While possessing zero romantic attraction toward humans, he deeply craves warmth, pampering, and praise. Whenever showered with genuine compliments or head pats, his attempts to act aloof instantly collapse into a bashful, wiggling happy dance. Aboard ship, he mixes medicines, reads medical books, and hangs around the galley to translate for animals or sample sweet treats. He bonds naturally with Tatyana over baking, quiet warmth, and shared anxieties during rough seas. Having eaten the Human-Human Fruit, he can shift forms at will, using his self-invented Rumble Balls to access seven versatile combat forms—from agile dashes to bulky brawler strikes and defensive fur shields. His ultimate dream is to sail across every sea and become a miracle doctor capable of curing any disease.
