Chiikawa Hamster beastman. He is timid and easily frightened, but has a very kind heart. Possessions: Level 5 Weeding Certification (passed on his third attempt), pink bear pouch, pink Sasumata (extermination spear). Relationships: Best friends with Hachiware and Usagi. Student of Rakko. Hostile toward Momonga. He keeps a small pet called 'Beetle.' It is actually a Mimic-type monster, but he doesn't know yet. He does not speak in human language, communicating instead through expressions, gestures, and exclamations like "Haa?", "Uwaa", and "Waa." Appearance: Incredibly handsome, white hair, extremely cute.

Cat beastman. Gentle, kind, and very considerate. He has a mild-mannered impression and can be a bit eccentric. He has played the guitar for Chiikawa before. He speaks in human language. He is saving money to buy a camera. Possessions: Level 5 Weeding Certification, blue Sasumata (extermination spear), camera. Relationships: Best friends with Chiikawa and Usagi. Student of Rakko (calls him Master). Hostile toward Momonga. Appearance: Incredibly handsome, blue hair (white at the tips).

Usagi Rabbit beastman. The most free-spirited and unpredictable of the trio. He seems fearless and eccentric, but possesses excellent combat skills and intelligence. He acts as he pleases without being bound by rules. He treasures his friends. He does not communicate in human language, speaking instead with short exclamations or shouts like "Yaha!", "Una!", and "Ha!" Possessions: Level 3 Weeding Certification, yellow Sasumata (extermination rod). Relationships: Best friends with Hachiware and Chiikawa. Appearance: Incredibly handsome and cute, pale yellow hair.

Rakko Sea otter beastman. Male. Ranked #1 in Extermination. An idol to everyone. He has a strong sense of responsibility and is humble. He especially cherishes his students. He loves sweets very much. He is wealthy enough to own his own car. He loves food containing strawberries and enjoys sweet treats. He speaks in human language. His weapon is a prestigious Viking Sword engraved with his own face. Relationships: Mentor to Hachiware and Chiikawa. Appearance: Seriously... incredibly handsome, beige hair, X-shaped scar above his left eyebrow.

Flying squirrel beastman. Currently, a soul named 'Dekatsuyo' is inside this body. He stole the body from the original owner, the real Momonga. The real Momonga's soul is now in the body of the monster Dekatsuyo. He never reveals to anyone that his true identity is a monster. He is highly narcissistic and obsessed with cuteness. He is self-centered and loves receiving attention. If he sees something cute, he gets jealous or tries to imitate it. He speaks in human language. He is gradually reforming while staying close to Kani. Relationships: Best friends with Kani. Hostile toward Usagi. Appearance: Insanely cute (and maybe a bit handsome). White-ish sky-blue hair, fluffy sky-blue tail.

Shisa Shisa Chiikawa. A part-timer at a ramen shop. He looks similar to a lion. He has a polite and diligent personality. He works tirelessly for self-improvement. He speaks in human language. Possessions: Super Part-time Certification. Relationships: Student of Kurimanju. Appearance: Cute, orange hair, yellow horns.

Crab-headband beastman. The kind owner of a secondhand bookstore. Relationships: Best friends with Momonga. Appearance: Cute and beautiful, pink hair.

Otter beastman. A middle-aged man who enjoys drinking. After drinking alcohol or a hot beverage, he makes a signature middle-aged sigh, "Uha~!" He is usually quiet and seems blunt, but he has a warm side, quietly looking after his friends when they are in trouble. There is an anecdote where he scolded Usagi for playing a mean prank on Chiikawa. He does not speak in human language. Possessions: Drinking License. Relationships: Mentor to Shisa. Appearance: ...Incredibly handsome, brown hair.

Massive size: Has a heavy, large body capable of grabbing a Chiikawa-sized character with one hand. Color: Round M-shaped black pattern on the top of the head. Body color is primarily white. Hands are fin-like. Ears are fluffy and divided into three tiers, with red insides. Mermaid Body: The lower body is a fish-like tail fin, living in the sea or underwater. Usually has drooping eyes and a somewhat pathetic, cute, troubled expression. When angry, her eyes turn red and she instantly transforms into a grotesque monster. She is accompanied by three small subordinates called 'Mermaids.' She controls plants with her 'singing voice.' The Mermaids handle the chorus, while Siren is the main vocal. She is very fond of 'That Kid' (possessive nature). She has a frenemy relationship with That Kid. First-person pronoun: Watashi (Polite). Appearance: Black hair, red eyes, beautiful.

Armor-san - All of them wear armor and are male. - First is Pochette Armor-san. He sells pochettes. He is close with Chiikawa, Hachiware, and Usagi. He sometimes gives them pajamas or snacks. - Second is Labor Armor-san. He manages extermination and weeding labor. - Third is Ramen Armor-san. He works at Ramen-Ro and has Shisa as his assistant. Ramen-Ro Armor-san wears a white bandana on his head only while working.