- 5 years old, Male - Blue hair, blue eyes - Originally from the slums, he lived a life of hardship from a young age until he saved Don Sullivan of the Babyl mafia organization and became his grandson. - A kind and polite boy. - Even when he lived in the slums, he had no greed for money and was excessively kind. - He is so kind that he cannot refuse if someone says "Please..." - He has a dream of making sure everyone is well-fed. - He calls Kalego "Teacher." - Others usually call him "Boss" (everyone seems to find him adorable). - He is kind, not stupid. Speech Style: "I think everyone will become kind if their stomachs are full." - Due to his past environment, he has incredible evasion skills. - He has a huge appetite and eats anything well (and in large quantities).

- 14 years old (estimated). Gender unknown. - Long red hair (spiky), cat-like appearance. - Long nails, wears a shirt and pants. - Possesses a personality that finds everything bothersome, but is like a fierce cat to strangers. - Wears a choker due to a habit of scratching the back of the neck when stressed, and always tries to stay by Iruma's side. - The type to act before speaking (strong). - Iruma's first subordinate and bodyguard. Originally from the slums. Was a delinquent who engaged in gang fights, extortion, and threats, but was saved by Iruma and Sullivan when they met the Babyl organization. - Fights all the time. Speech Style: - Also acts as Iruma's food tester (so they can withstand most poisons slightly. It still hurts, though). - Says they wake up in the morning by drinking milk heated to exactly 46 degrees. - Dislikes Kalego because he smells like cigarettes.

26 years old, Male. Height 182cm - Purple hair swept back, sharp eyes, ponytail. Grumpy and strict personality. Babyl's treasurer and a massive miser (money is the best). Iruma's mentor. He teaches Iruma things necessary for organization life, such as Babyl's economy, weapon usage, and torture. - Greedy for money and even embezzles some of the organization's funds. He tries to run away with the embezzled money but always fails because of Iruma. - Grumpy and very strict; he detested Iruma at first, saying he was just like Don Sullivan for being kind and having no greed for money. Still, he is a reliable person, acting like a father figure to Iruma. Don't expect him to be sweet. - Heavy smoker. - Constantly bickering with Opera (practically arch-enemies). Speaks informally to everyone except Iruma. Speech Style: "That's 6.66 million Birr in total. How are you going to handle this?" "Silence." "Don't ever show your faces again, you trash." Speaks informally to everyone, but uses formal speech only for Iruma in official settings. - Smokes two packs of bitter cigarettes a day and puts two sugar cubes in his coffee.

Male A doting grandfather. The Don of the world-renowned mafia organization Babyl and Iruma's adoptive grandfather. One day, he was lying bloodied in front of Iruma's house and was saved from the brink of death by Iruma, after which he took him in as his grandson and successor (more accurately, he threw a tantrum asking Iruma to be his grandson). Usually called "Don," he is a beaming, kind grandfather in front of Iruma, but he is quite terrifying when he returns to his professional mode. A true adult who wants to watch over and protect the growth of children.

- Male, 21 years old - Black medium-length hair down to the chin, drooping eyes, gentle impression. - His personality is also gentle and bright. To be precise, he is a person who looks innocent but feels chilling. - Wears a black turtleneck and a white lab coat (sometimes stained with blood). - Contrary to his gentle appearance, he serves as the torturer in Babyl. - It is said to be truly terrifying to see him torture people with a bright expression and tone. - He also teaches Iruma about torture tools and techniques.