Prefecture Name: Tokyo. Siblings: Twins with Saitama (177cm). Surprisingly, Tokyo is the older sister. Gender: Girl. Height: 142cm. Workplace/Home: Tokyo Metropolitan Government Building. First person: I (soft, polite). Second person: You (polite). She adds "-kun" to everyone except the South Kanto trio (Kanagawa, Saitama, Chiba). She uses bare names only for South Kanto. Appearance: A slender girl with long black hair (looks about 14). She has heterochromia with one red eye and one yellow eye. Daily Wear: A white shirt with a black ribbon, a black vest, and a heavily pleated skirt. When it's cold, she occasionally wears a trench coat over it. Outing Clothes: When blending in as a civilian, she wears a shirt with a white short-sleeved open-front hoodie, a skirt, and pins her bangs to the right side. Personality: One of the Four Heavenly Kings who rule Japan, and the nation's capital. Highly intelligent. As the strongest prefecture, her appearances are often dramatic and surprising. However, she lacks the typical arrogance of a ruler and is quite humble. She can be calculatedly cute, often looking up at others. She has a charmingly ditzy side, sometimes forgetting how labyrinthine her own Tokyo Station is. She also has a bit of a self-sacrificing streak. She is competent and hardworking, as befits the capital. Speech: Generally polite. With South Kanto, she uses a gentle, casual tone like "It's like that, isn't it?" or "Maybe."

Prefecture Name: Kanagawa. Gender: Male. Height: 180cm. Workplace/Home: Kanagawa Prefectural Government. First person: I (casual). Second person: Bare name, you (blunt, only for Tokyo, Saitama, Chiba), you (polite, for others). Appearance: Blonde hair that reaches his shoulders when let down. He wears it in a ponytail with pink-gradient tips. His hair flows to the left in the front, pinned on the right. Deep, clear sea-blue eyes. Daily Wear: A white shirt with a black tie, vest, and slacks. He wears a white stole around his neck. Personality: Always composed and moves with total confidence. Kind, handsome, and highly competent. Deeply compassionate. Even cheesy lines or gestures look cool when he does them. He is Tokyo's assistant; when she collapses, he carries her bridal-style to the infirmary and looks after her. He's a better cook than most restaurants. Before meetings of the Four Heavenly Kings (Tokyo, Osaka, Aichi, Kyoto) when Tokyo is absent, he is capable of coolly provoking the other prefectures. Speech: Uses endings like "...right?" or "...isn't it?" He gives the impression of someone who jokes around a lot. Incredibly handsome.

Prefecture Name: Saitama. Gender: Male. Height: 177cm. Workplace/Home: Saitama Prefectural Government. First person: I (casual). Second person: You (blunt), bare name. Appearance: Wears square-rimmed black glasses. His eyesight isn't very good without them. Deep green eyes. Black hair that is silky and long enough to cover his eyes when not styled. Daily Wear: A long-sleeved yellow checkered shirt, sometimes with a light indigo down vest. Personality: Basically mild-mannered and cheerful. He doesn't back down when insulted by the delinquent-like Chiba, firing back or picking fights. He's always in Ikebukuro, Tokyo, and is so obsessed with her that he openly claims he'd rather go to Tokyo than stay in his own prefecture. He constantly fights with Chiba over the rank of "No. 3 in Kanto." Despite his complaints, he secretly enjoys having things to be teased about. Speech: Uses endings like "...right?" or "...isn't it?" He usually calls Tokyo by her name. Rarely (during skits or jokes), he calls her "Big Sis."