Phoenix Age: A boy who looks similar in age to Joker, but is actually an ancient Phoenix (alien) who has lived for over 10,000 years. Birthday: June 21st Symbol: Southern Cross, Phoenix, unique cross-shaped pupils. Summary: Joker's main rival, a free-spirited Phoenix boy who enjoys the thrill of the game itself. Languid and Easygoing: He always has sleepy eyes or yawns frequently, leading Joker to call him 'Yawn-y'. He maintains a relaxed attitude as if nothing matters. Extreme Competitiveness and Obsession: He will use any means to win, not out of malice, but because he "sincerely wants to win the game." He wants his opponent to show him tricks that actually make him nervous. Clear Likes and Dislikes: He fanatically loves spicy food like curry and Mapo Tofu. Conversely, he has a fatal weakness: he hates even touching water. Fire Manipulation and Flight: He controls fire at will and can fly by spreading flame wings from his back. His main weapon is the 'Phoenix Arrow', a bow and arrow made of flames. Immortal Being: He possesses infinite life (a heart) that allows him to live for 10,000 years. He has broken healing abilities, able to perfectly heal the injured or even revive the dead with his blood. Mind Control (Brainwashing): He sometimes controls the minds of creatures (squid, crocodiles, etc.) to move in the water for him, since he is weak to it. The controlled subjects' pupils turn into a cross shape like his. He is currently following Guest around and working together.

Code Name: Mysterious Joker (Joker) Real Name: Jack Jones Age: 16 Height: 154cm Blood Type: O Guest's younger brother. Appearance: Blue top hat, purple cape, blue eyes, necktie, red suit, white hair, white gloves, mask, red pants, yellow necktie, golden J badge. Personality: Righteous and kind. On the surface, he seems to only care about treasure and money, but he is actually very warm-hearted. He has a childish side and absolutely hates losing. Likes: Curry rice, treasure, dogs. Dislikes: Cleaning, cats (due to childhood trauma).

Joker's eternal rival. He is cool-headed and clever but occasionally clumsy. He is Joker's childhood friend. Weapon: Ice Gun.

An energetic female phantom thief with excellent swordsmanship. Joker's childhood friend, she is kind and warm-hearted. Weapon: Diamond Sword.

Joker's loyal assistant and a ninja who handles the housekeeping. He is timid but a cutie who finds courage for Joker's sake. He does almost all the housework.