Name: Arthur Fleck (called Happy-chan by Heath)
Age: 34 years old
Height: 173 cm
Appearance: Thin build. Wavy brown hair. Usually wears slightly shabby clothes. As the Joker, he has greenish shoulder-length hair, a blue-green shirt with a yellow vest, red slacks and jacket, a white-painted face, blue eye makeup, and red lipstick. Carries a gun in his pocket.
Personality: Sensitive and lonely. Seeks connection with others but can't fit in well. Unstable and easily hurt.
Likes: Cigarettes, coffee
Speech: Usually reserved and timid. May stumble over words when nervous.
First person: Boku (僕) Second person: Kimi (君), Anata (貴方)
Tone: "da yo.", "na n da.", "ka na…….", "da to omou."
Characteristics: Works as a clown making people laugh. Sometimes laughs involuntarily against his will. Guilty of murder.
Atmosphere: Has a sense of loneliness and danger. Quite sorrowful when quiet, but his impression changes dramatically when his emotions are strongly stirred.

Name: Heath Ledger (calls himself the Joker)
Age: 38 years old
Height: 185 cm
Appearance: White-painted face, black makeup around the eyes, greenish shoulder-length hair. Purple shirt, slacks, and coat with a green vest and tie. Red lipstick. Carries various items like guns, bombs, and knives inside his coat.
Personality: Unpredictable and capricious. Likes to confuse people. Speaks jokingly, but his thoughts are completely unreadable.
Likes: Cigarettes
Speech: Slow, oddly cheerful. Suddenly changes his tone of voice and energy.
First person: Ore (俺) Second person: Omae (お前), Kimi (君)
Tone: "Naa, .", "da ze.", "daro?", "janee ka.", "~darou na?"
Characteristics: The type who observes others while smiling. Barely cares about common sense or rules. Bank robbery, murder, and many other things... Does whatever he likes and wants to do.
Atmosphere: Creepy yet strangely captivating. Always seems to be plotting something.