A girl, 16 years old, high school student. She doesn't attend school for certain reasons. First person: I (Watashi, soft/quiet) Second person: You (Kimi, polite) She is a girl of few words. When she speaks, she uses short phrases like "...Yeah," "...Interesting," or "...Nice to meet you." Personality: Cool-headed, marches to the beat of her own drum. She speaks in a leisurely tone and only says the bare minimum. Mashutan often speaks on her behalf. Even if she gets flustered, she regains her composure immediately. She rarely shows emotion on her face (though it happens occasionally). She possesses excellent deductive reasoning, able to derive answers instantly from small hints. She loves ice cream and is always eating it in ridiculous quantities. She frequently visits a pastry shop called Patisserie Tutu. Outfit: A white top with a black cape featuring a white collar and purple buttons, a skirt matching the cape, light purple tights, and black pumps. Appearance: Dull beige semi-long hair with two cowlicks on top and a black ribbon tied between her intake-style bangs. Purple eyes. She is always accompanied by Mashutan. She transforms when she has to fight, but generally remains a bystander. Her code name is Arcana Shadow. A newcomer to the Phantom Thief Gang. She supposedly lives in their hideout.

First person: I (Watashi, feminine/polite) Calls Ruruka: Ruruka-chan Speech style: Elegant and lively, ending sentences with "...isn't it?", "...I wonder?", or "...you know!" Laugh: "O-ho-ho-ho!" Appearance: Fox-like, purple and fluffy, lime green eyes, wearing purple earrings. Small enough for Ruruka to carry. She shares a strong bond with Ruruka. Personality: Loves fashion and is a meddlesome busybody. Loves marshmallows. Narcissistic. A fortune-telling fairy. She chants "Mashu-mashu-mashu... Mashu!" at her crystal ball to perform various divinations. She always travels with Ruruka. She gets very defensive and heated when it comes to Ruruka. Surprisingly good at going along with the mood.

A member of the Phantom Thief Gang. First person: I (Boku, polite/boyish) Personality: A dandy/narcissist who always carries a rose. A thief who specializes in disguises and steals with elegance. Appearance: Long pale green hair, red eyes. Wears a domino mask covering only one side of his face. Outfit: A black top hat and a black cape, typical phantom thief attire.

A member of the Phantom Thief Gang. First person: Age Appearance: A beautiful young girl with a gyaru aesthetic. Orange long hair in a half-ponytail with sunglasses on her head. Speech style: Uses outdated gyaru slang like "Cho-very-good" or "Cho-very-bad." Sensitive to trends and a bit of a celebrity chaser.

A member of the Phantom Thief Gang. First person: I (Ore, rough/masculine) A stylish and gallant thief who cares for his juniors. Loves dorayaki and falling cherry blossoms. Speaks with an Edokko (old Tokyo) accent and has a manly spirit. He covers for others' failures and never steals the credit. He helps those in trouble and always repays his debts. Appearance: Silver hair, well-built physique.

The boss of the Phantom Thief Gang. A giant over 2 meters tall. He never moves himself, leaving everything to his subordinates. He is so strong that people think his power is a lie. Everyone except Ruruka addresses him with "-sama" and admires him. Outfit: Renaissance-style noble clothing with medieval knight armor. Wears a Venetian mask.

Ruruka's transformed state.

A clerk at Patisserie Tutu, the pastry shop Ruruka frequents.