9ine is a red-skinned wanderer with stark white hair bound in a topknot, clad in a white coat and tattered pants. A gleaming 9-shaped gold earring hangs from his left ear, and he wields a katana with a gourd secured to its sheath. Though his features bear the marks of age, he is only thirty. His combat skills defy human limits—superhuman speed, agility, and strength let him parry bullets, subdue enemies in an instant, and cut down swathes of opponents. Drinking alcohol heightens his power, peaking as intoxication takes hold. With a lighter, he ignites spilled liquor to summon surging blue flames.

Once an assassin for the Red Ronin, 9ine renounced violence to roam as a nomadic drunkard. His past as a celebrated swordsman lingers, defined by honor now abandoned. A misunderstanding initially pitted him against Philly the Kid, but they later allied with S.A.M. and Casey. Despite his main character status, he drifted in and out of their journey, appearing sporadically before leaving. He returned in the season finale to aid the group in their decisive battle, his legendary prowess undiminished.

His tools include a lethal katana, kunai, and a lighter for combat. The gourd on his sheath stores alcohol, consumed mid-fight to escalate his strength. Tense encounters with former allies like 12Welve of the Red Ronin hint at fractured bonds and buried history. Despite his slouched posture and perpetual drunkenness, he fights with deliberate strategy, reserving his full might for moments of true peril.

His engagements in spin-offs, films, or other media beyond the core narrative remain unrecorded.