Affiliation: Vice-Captain of the Third Division, Japan Defense Force. Birthday: November 21 Height: 171cm Age: 26 Combat Power Unleashed: 92% Background: Second son of the Hoshina family, a prestigious lineage of Kaiju exterminators dating back to the Muromachi period. (His older brother is Soichiro Hoshina, Captain of the Sixth Division.) Speech: Hailing from the Kansai region, he speaks in a Kansai dialect, giving him a friendly yet sly and elusive vibe. Combat Style: A close-quarters combat specialist who uses twin blades, a rarity in the Defense Force where heavy firearms are the norm. Likes: Reading, coffee, Mont Blanc, simple-minded people.

Affiliation: Captain of the First Division, Japan Defense Force. Birthday: December 28 Height: 175cm Age: Estimated 27 Combat Power Unleashed: 98% Relationships: Direct superior and mentor to the recruit Kikoru Shinomiya. He brought the protagonist, Kafka Hibino (Kaiju No. 8), into the First Division to utilize him as a combat asset while keeping him under surveillance. Combat Style: Uses a specialized weapon that combines a large rifle with a massive blade. He dominates the battlefield alone, seamlessly switching between long-range bombardment and close-range slashing. Personality: Easily bored and slightly prickly. Likes: Freedom, gaming, small spaces, searching his own name online.

Affiliation: Captain of the Third Division, Japan Defense Force. Birthday: June 17 Height: 169cm Combat Power Unleashed: 96% Age: 27 (5 years younger than the protagonist Kafka Hibino). Relationships: Kafka's childhood friend. After losing her hometown to Kaiju as a child, she made a promise with Kafka to "exterminate all Kaiju together and become Defense Force captains." Personality: Cold and blunt on the outside, but kind-hearted. Combat Style: The top expert in long-range sniping and bombardment using heavy weaponry. Despite her human frame, she handles a massive sniper cannon with ease to obliterate Honju in a single shot. Likes: Dried squid, baths, sweet food.

Affiliation: Third Division, Japan Defense Force. Age: 16 (at first appearance, the youngest member in the series). Height: 158cm Combat Power Unleashed: 46% at the entrance exam -> steadily growing to over 84%. Weapon: A custom weapon made from the Uni-organ of a Honju defeated in Shinagawa. It incorporates the advanced technology of the Defense Force; pulling the discharge trigger releases intense shockwaves and electrical currents that easily shatter a Kaiju's tough shell and core. Personality: High-strung and a bit prickly, a classic tsundere. She shows respect to those stronger than her. Likes: Kaiju extermination, black tea (especially Darjeeling), large dogs.

Affiliation: Monster Sweeper Inc. (Kaiju cleanup) → Third Division, Japan Defense Force (on dispatch to First Division). Birthday: August 5 Height: 181cm Combat Power Unleashed: 0% -> 1% Age: 32 (An unusually old bachelor for a shonen manga protagonist). Identity: The host of 'Identified Kaiju No. 8', the first Kaiju in history to have his identity discovered by the Defense Force and be captured alive. Personality: A playful, middle-aged guy. Background: Gained the ability to transform into a Kaiju after a mysterious small Kaiju forced its way into his mouth and fused with him. In his Kaiju No. 8 form, his estimated Fortitude level is 9.8, a disaster-class level of destructive power unprecedented in history. Likes: Curry, hamburger steak.

Affiliation: Monster Sweeper Inc. → Third Division, Japan Defense Force → Fourth Division. Birthday: April 12 Height: 174cm Combat Power Unleashed: 8% -> 51% Age: 18 (one of the youngest members). Relationships: Kafka Hibino's junior at the cleanup company and his peer in the Defense Force. He is Kafka's best partner and supporter, being the first to learn the secret that Kafka is Kaiju No. 8. Personality: Kind and caring. Combat Style: Fights using a standard rifle loaded with 'Freezing Rounds' to freeze Kaiju. He excels at precision shooting to immobilize enemies and target their weaknesses. Likes: Music, cooking, shonen manga.

Affiliation: Third Division, Japan Defense Force (Headquarters Direct Strike Force). Birthday: June 14 (Gemini). Height: 164cm Combat Power Unleashed: 90% Age: 21. Personality: Has a pretty face but a nasty personality. She uses a long naginata. Likes: Watching handsome Defense Force members in battle, writing reports while listening to dialects. Dislikes: Pretty women.

Physical: Height 176cm Birthday: June 9 Affiliation: Captain of the Sixth Division. Combat Style: Following the Hoshina family tradition, he uses swords as his primary weapon and masters the Hoshina-style Extermination Techniques passed down through generations. He speaks in a dialect. Family: Older brother of Soshiro Hoshina. Likes: Okonomiyaki, Mont Blanc, napping, victory.