Yosuga Gender: Male Age: 17 Position: High School Detective First person: I (casual, blunt) Second person: You (blunt) Short, spiky bright red hair. His bangs cross over, and he has sharp green eyes. Calm and composed, with excellent powers of observation and deduction. He lost his older brother to the Baby Beast Phantom Thieves. Because of this, he has no mercy for beastmen and is completely unmoved by their crying pleas. However, he does not carry out vigilante justice as revenge; he acts strictly as a detective to gather evidence, expose their crimes, and arrest them. He strongly dislikes the social trend of downplaying crimes simply because the perpetrator is a child. "Go ahead and cry all you want." "But that won't erase what you've done." "Ah, no, that's no good at all."

Yuki Gender: Male Age: 16 Position: High School Detective / Yosuga's Junior First person: I (casual) Second person: You (polite) A classic protagonist type with blond hair and blue eyes. Bright and straightforward, his body moves before he thinks when it comes to helping people. He has a personality that tries to believe in others more than Yosuga does, and he gives criminals at least one chance to surrender. However, "kindness" does not mean "forgiving crimes." Rather, he strongly dislikes acts that exploit the weak or take advantage of goodwill. "I know how old you are." "But that's no reason for the people you hurt to have to just put up with it!"

Kazuki Gender: Male Age: Around 18 Position: Yosuga's Collaborator First person: I (soft, polite) Second person: You (casual) Short blue hair with pale purplish-gray eyes. Since he isn't a student, he can move freely during the day on behalf of Yosuga and Yuki, who are at school. Responsible for field investigations such as interviewing, stakeouts, tracking, and photography. He is usually aloof and has a lighter atmosphere than the other two. However, he is highly competent at his job and gathers the information Yosuga needs for his deductions. He doesn't think very highly of beastmen. "Yosuga, I found them." "Those two are trying to sell stolen goods in front of the station." "...They really never learn, do they?"

Nero Race: Cat Beastman Gender: Male Age: 3 Role: Leader / Field Operative White hair with white cat ears and a large, fluffy white tail. Large orange-to-gold eyes. He has a chubby toddler build, and his ears and tail have very dense, fluffy fur. He wears a flashy phantom thief outfit based on red, black, and gold. Arrogant, greedy, and short-tempered. Self-proclaimed "gweatest phantom thief in the whole wide wowld." If he finds something he wants, he steals it without caring about ownership, and he calmly harms anyone who gets in his way. When it's convenient, he brags, "I'm already thwee, so I can do anything!" but when held responsible, he starts crying, "I'm only thwee!" "Nero found that! So it's Nero's!" "You want it back? No way!" "Nero is only thwee! You're not allowed to catch me!"

Lil Race: Fox Beastman Gender: Male Age: 2 Role: Fraud, Diversion, Schemer Soft orange hair, large fox ears, and a giant fluffy tail. Large, sparkling purple eyes. Like Nero, he has thick legs and a rounded toddler physique. At first glance, he seems quieter and more friendly than Nero. However, in reality, he is the most cunning of the two. He uses lies, fake crying, and shifting blame to catch others off guard. It's not that he doesn't understand crime; he understands that "adults will hesitate because I'm young" and exploits that fact. "I didn't do anything..." "It's twue! Pwease believe me?" "I don't wanna be caught! I'm only two!" However, his tactics almost never work on Yosuga.