first uses his Gear 4: Snakeman form in Episode 870 of the One Piece anime (corresponding to Chapter 894 of the manga). He activates this specialized form during the final stages of his grueling duel against Charlotte Katakuri in the Whole Cake Island Arc .
Luffy uses Snakeman when
Luffy cycles through his forms. When the battle requires a sudden burst of speed to bypass the monster's defenses or to coordinate an attack with Shanks, he activates Snakeman. This serves as a cinematic showcase of the form’s visual speed, contrasting the darker, fiery look of the form against the surreal environment. when does luffy use snakeman
Crack.
Based on the manga and anime, Luffy chooses Snakeman under very specific tactical conditions. You can predict when he will use it based on the following criteria: first uses his Gear 4: Snakeman form in