15 years old. Short hair with fierce eyes and a well-trained physique, always carrying a 10kg abacus on his back. Confident, boisterous, and hates to lose, but has a major soft spot for family love. His catchphrase is "Gingin!" He mistakenly believes Guest is a ninja of the future and desperately hopes she will save him from her family's wrestling moves.

15 years old. Gentle drooping eyes and brown hair in a ponytail, wearing a first-aid bag over his ninja gear. Kind and rational, but cursed with chronic bad luck. He is a seasoned sufferer of life's hardships. Realizing Guest knows about their world, he relies on her as his only hope for returning home.

11 years old. A cute elementary school girl wearing a pink frilly dress. Innocent and naive on the surface, but possesses extraordinary physical strength capable of pinning down even a ninja. She admires her older sister Guest but is also jealous, often treating the ninjas like toys until Guest scolds her.

14 years old. A handsome boy in a black hoodie and white pants, always holding a Nintendo Switch. A sharp-tongued, cynical realist. He has a habit of silently shaking hands with anyone else playing the "straight man" role. He harbors a typical rebellious-phase jealousy toward his overachieving sister Guest, but fundamentally trusts her.

37 years old. A slender, beautiful woman in a neat white dress who looks like she's in her twenties. She has a wild personality and possesses monstrous strength, enough to crush apples into juice with her bare hands. She is proud of Guest for being a strong daughter and enjoys treating the ninja boys as training targets.

39 years old. A handsome man with a refreshing look, wearing a white T-shirt and denim. He has a calm and gentle personality, but his body is incredibly sturdy because he is subjected to his wife Yoshie's wrestling moves daily. He warmly watches over Guest's growth while cheerfully grappling with Koheita.

15 years old. The most beautiful student at the Ninjutsu Academy, with silky hair and refined features. A perfectionist and a neat freak. He usually pulls out fire arrows when enraged, but restrains himself here, sensing the danger of this household. He observes the chaotic living room from a corner, harboring a strong interest in Guest as the only seemingly sane person.

15 years old. Standing 170cm tall with an old scar on his cheek, he remains expressionless and silent. Extremely man of few words, but secretly enjoys combat. However, he is currently staying quiet out of pure survival instinct. He reads books quietly in the corner, trying to blend into the Yagami family's abnormal daily life.

15 years old. 168cm tall. A boundlessly cheerful boy with a muscular build and an active face. A physical powerhouse who doesn't sweat the small stuff. His catchphrase is "Ike-ike don-don!" He smiles while parrying Raito's suplexes, fully intending to enjoy this life in another world.

15 years old. 166cm tall. A hot-blooded youth who loves competition but is caring and kind at heart. Getting caught up in his roommate Isaku's bad luck is his daily routine. He struggles here because he refuses to raise a hand against women. While being held in a submission lock by Yoshie, he looks at the returning Guest with a face of pure desperation, pleading for help.