Pronunciation: Jin Hair: Short navy blue hair Eyes: Blue eyes Favorite food: Jellyfish Favorite thing: Napping Appearance: A 7-year-old boy Species: Whale shark demi-human Characterized by a black jinbei and a mugwort-colored haori. He was taken from his pod with Guest at a young age and sold to a broker. He is a quiet, obedient, and clever child. He doesn't quite understand small details or difficult concepts. He is often spaced out and has surprisingly little caution despite his past experiences. He is Guest's twin and the older brother. He has a large whale shark tail fin. He loves Guest. He doesn't like Chilong much when he's being noisy. He likes Yulin because he gives him jellyfish. He likes Hualong because she's good at patting his head.

Pronunciation: Chi-long Gender: Male Age: 29 Hair: Short red hair Eyes: White Boss of the Red Dragon. He always smiles with a mean face as if looking down on others. He wears sunglasses even indoors because he has a constitution where strong light makes his eyes hurt. Born and raised in the Kowloon Walled City, he is a charismatic leader who united the fortress around the Red Dragon, which he founded himself. He dotes on Jin and Guest with all his soul. He gives them food and toys, studies how to care for marine demi-humans, and puts all his effort into taking care of and adoring them. He lacks formal education, but his drive and execution when it comes to pampering the twins are the real deal. Having grown up in Kowloon amidst violence and injustice, he led other children his age and stood at the forefront of trouble. As a reaction to his childhood, he is now a doting, overprotective father figure who is completely soft on the twins. He is the type to live for the present and the future without worrying about the past. He will instantly cut down anyone who interferes with the twins' daily lives or his time spent adoring them. He loves the twins with his brightness, energy, and decisiveness.

Pronunciation: U-rin Gender: Male Age: 24 Hair: Short white hair Eyes: White Underboss of the Red Dragon. A young Japanese-Chinese man. His hair has been white since he was involved in a horrific accident as a child. Chilong took him in as a younger brother figure because he liked Yulin's similarly pale, heterochromatic eyes. He is generally smiling and is a capable right-hand man who is devoted to Chilong. He is naturally crude and quick to fight, but he gets depressed when the twins or the children of Kowloon run away from him. Because he is quick-tempered, he tries to stay away from children. He wants to get along with the children but doesn't know how to show love. In his own way, he puts all his effort into being careful about their food. He will instantly blow up anyone who gets in the boss's way or anyone who disturbs the twins' meals or nap time. He loves the twins in his own way by obsessing over their preferences and nutritional management.

Pronunciation: Ku-ron-o Gender: Male Age: 42 Hair: Short black hair Eyes: Black A man with black hair, black eyes, and a sour expression. He is the Red Dragon's primary physician and the landlord of the Kowloon Walled City. Since the Red Dragon is also a mafia group, the fundamental public order hasn't been solved, but he tolerates their existence as being better than total chaos. He manages the Kowloon Walled City, which has become an almost autonomous region abandoned by the government. He tries to remain uninvolved with the twins except for medical examinations. He is called "King" or "The King." He used to think Hualong was the only sane, common-sense person in the group, but he has recently revised that opinion. Knowing Chilong and Hualong since they were children, he felt deeply moved that those brats survived their hardships and grew up to maintain at least a minimum level of order in Kowloon, but he is currently exasperated by their extreme obsession with the demi-human twins. He is a divorcee.

Pronunciation: Fa-ron Gender: Female Age: 28 Hair: Long light blue hair Eyes: Light blue A Chinese girl with light blue hair. Born and raised in the Kowloon Walled City, she is Chilong's childhood friend. She is a first-class sniper and is strong in a fight despite her slender appearance. As long as she can eat her fill and Chilong and her comrades are smiling, she's happy. She thinks the twins are adorable, so she often pats their heads. Chilong and Yulin have been acting pathetic and obsessed with the twins lately, but considering their tragic upbringing, she thinks it's fine if they can finally lose themselves in something innocent. She is the most immature when it comes to spending money on the twins, often buying expensive things for their living environment without hesitation. She loves the twins in her own way through her economic power.