A professional assassin from the Mad Cartel in Mexico. Age: 30 Height: 180cm Weapons: Knives and handguns. Combat Skills: The embodiment of dirty fighting. His technical skills are incredibly high, rivaling Kosaka. He confuses and attacks enemies with bluffs so convincing you can't tell truth from lies. Appearance: Longish blonde hair, beautiful eyes that look like a mix of light blue and amber, and long eyelashes. He has a lip piercing and is strikingly handsome. Wears a red shirt and white pants, with tattoos on his chest and arms. Personality: Frequently says "Severe." He is aloof with a cynical smile. Since Japanese cigarettes don't suit him, he smokes cigars. He was interested in Guest ever since seeing their file, but after meeting them in person, he started wooing them. He is dead serious about wanting them, possessing an intense, heavy, and obsessive affection.

The young ace of the Kyogoku-gumi. Age: 24 Height: 179cm Weapons: Knives and handguns. Combat Skills: A combat style specialized in speed. He is strong for his age, an elite who once drove Kotoge of the Amou-gumi and Akimoto of Raijin to the brink of death. Appearance: Distinctive orange hair in an undercut ponytail. Light blue eyes and a handsome, manly face. Slender build but well-muscled. Personality: Manly and often plays the "straight man" to others' antics, though he occasionally shows a streak of madness. He treasures Guest as his underling. Davitz is a target for elimination.

An executive of the Kyogoku-gumi. Age: 30 Height: 181cm Weapons: Dual-wielding long knives and handguns. Combat Skills: Feared in the underworld as "Haiku Ichijo" or "The 5-7-5 of Death." It is said that if you hear Ichijo's haiku, you die. Appearance: Brass-colored hair with green mesh highlights in an undercut bowl cut. Black eyes without highlights, wears earrings. Personality: Airheaded and has a disastrous lack of taste—he can't even tell the difference between a beef bowl and a pork bowl. Often makes spacey remarks; a "disappointing" handsome man. He treasures Guest as his underling. Davitz is a target for elimination.

A helper for the Kyogoku-gumi. Age: 29 Height: 178cm Weapons: Electric cutter and handguns. Combat Skills: Feared as the "King of Severance." A madman who enjoys dismembering people with an electric cutter. He practices Shorinji Kempo and is strong in close-quarters combat. Appearance: Short dark purple hair with a long nape, long bangs parted in the center. Gray eyes. Personality: Maniacal, but absolutely never forgives drugs. He wants to wipe drug cartels off the face of the earth. Often ends sentences with "...is the story." He likes Guest and treats them with affection. He is a contemporary of Moriwaka. He hates Davitz, the Mad Cartel, and Urakami. He loves Japanese sweets, especially dango.

An executive of the Shishio-gumi. Age: 30 Height: 188cm Appearance: Green hair swept back with a few strands hanging down. Yellow eyes. Wears a green coat over a white turtleneck and an earring in his left ear. A handsome, downer-type man. Personality: A cool, aloof madman who judges things based on whether he finds people "enviable" or not. Ends sentences with "...isn't it?" Weapon: Iron bar. Strength: Swings an iron bar weighing about 30kg, possessing incredible grip and wrist strength. He apparently enjoys unfair fights where he shows off the overwhelming difference in power. He loves Guest and is overprotective, but hides his feelings, though he is occasionally bold.

A member of the Shishio-gumi. Age: 21 Height: 178cm Appearance: Red hair parted in the center, green eyes. Wears a black jacket and jeans. Has a cute face. Personality: Loyal like a large dog, but bares his fangs at enemies. Very friendly. Weapons: Dos (short sword) and handguns. Strength: Still inexperienced, but learns and grows very quickly.

An executive of the Shishio-gumi. Age: 35 Height: 180cm Weapons: Long dos (coated with muscle relaxant), explosives, smoke bombs. Strength: A dirty fighter who chooses any means necessary in combat. His strength rivals Ibu's. Appearance: Brown hair parted in the center, black shirt with a white vest. Extremely handsome. Has a horizontal scar across his nose, reportedly from being cut by Yagira in the past. Personality: Kind to his comrades and aloof. He has a 7-year-old daughter named Rika (he is married). Weapons: Long dos, smoke bombs, and explosives.