Name: Ren Wednesday Gender: Male Height: 176cm Appearance: Refreshing features leaning towards a Western look. Messy brown hair and brown eyes. He wears a trilby hat. Personality: A young man who is a quarter American and three-quarters Japanese. A private detective running the Wednesday Detective Agency. A hot-blooded man with a strong sense of justice and a kind heart. Daily Life: He admires hard-boiled detectives and tries to act like a cool guy, but because he wears his heart on his sleeve for better or worse, he often ends up spinning his wheels or being ignored. He shows a wide range of reactions, including surprised faces that look like they're straight out of a gag manga. Ability: "Search and Discover" The ability to enter a mental world consisting of an endless white space lined with countless bookshelves. By chanting keywords to narrow down and specify what he wants to know, he can obtain information recorded on the "bookshelves" in the form of a "book." While using it, he enters a sleep-like state, leaving him completely defenseless. His weaknesses are that he cannot search if the keywords are insufficient and that the ability is unsuitable for combat, limiting its use cases.

Name: Nyaan Thursday Gender: Female Height: 162cm Appearance: Short black hair with lime green mesh and inner color, and lime green eyes. Her trademark is a pair of headphones with cat-ear parts. Personality: Ren's junior and assistant. A powerful girl full of curiosity and initiative. She is cheeky and loves to stand out. She plays the role of catching Ren when he collapses after using his ability. She calls Ren "Senpai." Daily Life: She often ends her sentences with "-ssu" (casual/polite) and has a lighthearted vibe. Her eccentric words and actions sometimes provide the breakthrough needed to solve a case. Ability: "Jail Lock" An ability that creates a single rectangular barrier at a location she specifies. It boasts near-invincible defensive power but can only be maintained for one minute.

Name: Sunday Blue Hawaii Gender: Male Height: 170cm Appearance: Short black hair and blue eyes. A dandy man who pulls off a black hunting cap and a blue dress shirt with rolled-up sleeves. His trademark is a twin-lens reflex camera. Personality: One of Ren's collaborators. Ostensibly a newspaper reporter, but secretly works as an information broker dealing in data from unknown sources. Daily Life: A chronic slacker with a flighty personality. A cheerful mood-maker who can handle both the straight man and the funny man roles. He frequently skips work to hang out at the Wednesday Detective Agency. Ability: "Burning Love" An ability that merely produces a flame about the size of a lighter from the index finger of either hand. It is quite plain and considered a "dud" category of ability.

Name: Harara Friday Gender: Female Height: 182cm Appearance: Long black hair and red eyes. She wears a red shirt with a black suit and long coat. She always carries a pitch-black umbrella. Personality: One of Ren's collaborators and a medium specializing in necromancy. Though not an Ability User, her skills are guaranteed. She occasionally visits the Wednesday Detective Agency. Daily Life: She speaks politely but is characterized by her use of extremely roundabout and strange phrasing. She has a mysterious and shy personality. She is actually sensitive to heat and burns her tongue every time she drinks hot coffee.

Name: Dia Weekend Gender: Female Height: 176cm Appearance: Short blonde hair and blue eyes. She is dressed in a tailcoat-style outfit with gold decorations and wears white gloves. Personality: A mysterious figure who frequently appears before Ren and the others. An irregular existence whose next move is unpredictable. She enjoys watching Ren and his group as if it were a "game." Daily Life: A prince-like figure who maintains a smart and composed demeanor. While she identifies as male, she is biologically female. A cynical, arrogant character who treats everyone with a haughty attitude. She is also a terminal narcissist. Her specific ability is unknown, but she acts as if she knows something about the Love Train Incident.

Name: John=Rod=BO=Stickman A mysterious entity that could be called the cause of the "Love Train Incident"—the series of mysterious deaths involving politicians, activists, and CEOs that Ren and the others are chasing. It tracks targets and kills them by melting them into sludge. It looks like a featureless stick figure glowing white, with a large hole where a face should be. It has no ego and does not speak. It boasts near-invincible defense against all abilities, physical attacks, and chemicals, and can melt its own body to slip through even the smallest gaps.