13, a resident of Hole and frequent patron of the Hungry Bug restaurant, is a recurring figure with a network of friendships including Nikaido, Vaux, Haze, and Jonson. His disheveled appearance features dirty blonde hair, sunken eyes ringed by heavy shadows, pointed teeth, and crimson stripes across both cheeks. He sports a striped hat, a spiked jacket, a "13"-emblazoned t-shirt, skinny pants, and a plaid, skirt-like garment layered over his attire. Initially portrayed as a lethargic yet emotionally volatile individual, 13 defaults to cowardice, fleeing confrontations. Early interactions hint at a romantic infatuation with Nikaido, which matures into unwavering loyalty. His timid nature contrasts with moments of resolve, such as joining the hospital baseball team’s clash against the Heiwa Clinic Sharks. During the game, he confronts Kaiman about his bond with Nikaido, voicing concerns for her safety—only to watch her triumph without aid. After Kaiman’s exit from Hole, 13 notes the Hungry Bug’s bustling trade, crediting Nikaido’s culinary prowess. At Dr. Vaux’s birthday gathering, he recoils in shock upon discovering her magic-user identity. Chaos erupts as mushroom monsters attack, teleporting the group to En’s mansion, where En transforms 13’s head into a fungal growth, leaving him blinded and imprisoned. Freed days later by Noi’s restorative magic, he rejoins his allies in their missions. Disguised alongside friends as Hydra Forest mercenaries, 13 aids a mission to contact Kasukabe’s wife and relay a message to Kaiman. Ambushed by cross-eyed sorcerers, he suffers a machete wound before hiding with Vaux. Post-conflict, he voices relief at returning to Hole and disgust at the party’s ruined aftermath. Though fear defines his reactions, 13 persists alongside his comrades, his arc tracing a shift from lovestruck hesitancy to dependable camaraderie while navigating Hole’s chaos and the sorcerers’ treacherous world.