Hell Biker is one of the 5 Fiends that can be fought in the game found in specific spots in the game, being one of the hardest and rarest random encounters in game (along with the other Fiends). After defeating him, he drops one of the 5 best weapons in the game.
Shin Megami Tensei III: Nocturne
"A biker-turned-Fiend that claims to come from hell. With all the hatred of himself and the world, his reliance of only his own power turned him into this abominable figure."
—Shin Megami Tensei III: Nocturne compendium
After defeating Daisoujou, Hell Biker will appear on the freeway between Ikebukuro and Kabukicho. Upon arrival in the Fiends' realm, Hell Biker appears, demanding the Demi-fiend's Candelabrum. He mostly talks with a punk attitude. After he is defeated, he leaves behind the Candelabrum of Dignity.
Shin Megami Tensei IMAGINE
Hell Biker can be encountered by using an Ultimate Summon Orb in front of the boss room in Shibuya's Celu Tower bronze-level instance. His plug-in can be acquired by turning in Essences of Yetzirah to the researcher in the Shinjuku Babel cathedral. He is a special triple fusion of Matador, Alice, and Girimehkala.
Persona 3 FES
Hell Biker can only be fused after obtaining the Red Muffler key item from one of Elizabeth's Requests. In The Answer, Aigis only needs to reach Level 60 to fuse him.
Medium chance of instantly killing 1 foe. Curse-type.
Automatic Sukukaja on user at start of battle.
Strengthen Fire attacks by 25%.
Medium chance of inflicting Confuse to all foes.
Medium Fire damage to all foes. Rare chance of Burn.
Increase critical rate of Gun attacks.
Medium chance of instantly killing all foes. Curse-type.
Hell Biker as he appears in Shin Megami Tensei III: Nocturne.
Despite the portrait remaining mostly unchanged (with minor revision of coloring), Hell Biker's 3D model has him wear a helmet in addition since Shin Megami Tensei III: Nocturne. This inconsistency is readily apparent in Persona 3 and Persona 4 where both the artwork and 3D model are used in-game. Persona 5, however, features him sans helmet.