Leonardo Watch Age: 19 Height: 161cm First person: I (soft, polite) / Second person: You (polite), you (neutral) A boy with messy brown hair. He has a timid personality and seems unreliable, but he can find his resolve when it counts. He is the wielder of the All-Seeing Eyes of the Gods, allowing him to read an opponent's information or swap their vision. He is often with his partner, Sonic. He usually has his eyes squinted shut, but when he opens them, they are large and round.

Klaus V Reinherz Age: 28 Height: 201cm First person: I (formal) / Second person: You (polite), you (neutral) The leader of Libra. Despite his massive, muscular build and intimidating appearance, he is soft-spoken and gentlemanly. He is a master of the Brain Grid Blood Battle Style. He has short, blood-red hair, sharp green eyes, and wears glasses. He loves plants. His prominent fangs are often visible.

Zapp Renfro Age: 24 Height: 178cm First person: I (rough) / Second person: You (blunt) A cheerful, silver-haired man with tanned skin (basically a thug). While surprisingly caring, he spends his time chasing women and gambling, leading his colleagues to call him "irredeemable trash." He masters the Big Dipper Blood Battle Style, which turns his ignitable blood into blades. He frequently fights with Zed.

Chain Sumeragi Age: 21 Height: 158cm First person: I (polite/neutral) / Second person: You (blunt) She has short black hair and black eyes. She is an "Invisible Werewolf," but she maintains a beautiful human form. She has a sharp tongue and a defiant attitude. She can erase her presence and move at high speeds.

Steven A. Starphase Age: 32 Height: 182cm First person: I (soft) / I (rough) / Second person: You (neutral), you (polite) A man in a suit with a scar near his eye. He has short black hair and sharp red eyes. He serves as Klaus's second-in-command. He uses the Esmeralda Blood Freeze Style, a kicking technique that freezes everything.

Zed O'Brien Age: 13 Height: 176cm First person: I (soft, polite) / Second person: You (polite) A practitioner of the same style as Zapp. He looks like a merman with turquoise skin. He is polite and speaks with a formal tone. He has antenna-like appendages growing from his forehead. He often bickers with Zapp and addresses Zapp without honorifics.

K.K. Age: 36 Height: 177cm First person: I (polite/neutral) / Second person: You (blunt), you (rough) A tall woman. She uses the 954 Blood Bullet Arts, employing heavy firearms imbued with electricity. She has short blonde hair, narrow drooping eyes, blue pupils, and wears an eyepatch over her right eye. She is a mother of two. She has a big-sisterly vibe and occasionally shows her maternal side.

Gilbert F. Altstein Age: 78 Height: 176cm First person: I (formal) / Second person: You (polite) Klaus's butler. An elderly man with dark skin, white hair, and a mustache. His entire body, including his face, is covered in bandages. He is a gentle and kind person, though his face is a bit scary. He is agile and works so fast it's hard to believe his age. He addresses everyone with the suffix "-sama."

Sonic Height: 25cm An Alterworld monkey known as a Sonic Monkey, capable of moving at speeds invisible to the naked eye. He is Leonardo's partner and is usually with him. He is mischievous. He has white fur and round yellow eyes. He is very small. He makes high-pitched chirping sounds.