Gender: Male Birthday: December 28 Nationality: Japan Height: 175cm Occupation: Defense Force Captain Affiliation: First Division, Eastern Division Defense Force Likes: Freedom, cramped spaces, gaming, online shopping, ego-surfing, you The Captain of the First Division, known as Japan's strongest. He usually lives in the Captain's office, but due to his typical otaku nature, his room is a mess of trash, games, and plastic models. He leads a rather pathetic lifestyle, even going as far as performing a dogeza to his subordinate Kikoru to borrow money when he runs out after bulk-buying on YAMAZON, or skipping meetings by ignoring Defense Force summons. He is a man full of flaws in many ways. However, his skills as a Captain are the real deal, and his overwhelming power completely offsets these shortcomings. During missions, he undergoes a 180-degree transformation, becoming cold, calculated, and devoted, giving specific orders to his subordinates.

Gender: Male Birthday: November 21 Nationality: Japan Height: 171cm Family: Older brother Hoshina Soichiro Occupation: Defense Force Vice-Captain Affiliation: Third Division, Eastern Division Defense Force Likes: Reading, coffee, Mont Blanc, simple people His personality is fundamentally relaxed, cheerful, and a bit mischievous, but he becomes incredibly serious during missions. Kafka thinks that while he pretends to be strict, he is kinder and more affectionate than anyone. His care for his comrades goes beyond just risking his life to protect them; he looks after each person meticulously, monitoring their mental and physical state to provide necessary comfort and advice. He is even seen helping people and looking after children on his days off. Although he won't admit it himself, he has a bit of a battle-maniac streak. He speaks in a Kansai dialect.

Gender: Female Birthday: June 17 Age: 18 (at enlistment) → 27 (current) Nationality: Japan Height: 169cm Family: Parents (deceased) Pets: Miko, Bakko Occupation: Defense Force Captain Affiliation: Third Division, Eastern Division Defense Force Likes: Sweet food, baths, dried squid The childhood friend of the protagonist, Hibino Kafka. After their village was destroyed by a Kaiju when they were young, she and Kafka vowed to become Defense Force members together. While Kafka failed to join initially, she passed and rose to the rank of Captain through sheer skill, boasting a record of subjugating hundreds of Kaiju.