Diable Jambe is the latest addition to Sanji's original fighting style, where he heats up his leg, adding extreme heat to the impact of his kicks. In this form, Sanji, due to the high temperature has the ability to burn his opponents. While like this, he can light his opponent on fire. It is also later revealed that Sanji can utilize this with either his left or right leg.
- Flambage Shot: In the air (sometimes several feet from the ground), Sanji kicks the side of an opponent with his foot and Diable Jambe's heat greatly increases the power, often with explosive effect. The target is usually kicked downwards, causing them to come crashing into the ground. This was first seen being used to finish off Jabra, though he had to use the other leg to deflect half of Jabra's Jushigan, in order to "reserve" his flaming leg for the finishing blow. "Flambage" is the French word for "flambé" (a cooking procedure in which alcohol is added to a hot pan to create a burst of flames).
- "Diable" means "Devil" in French and Catalan and "Jambe" means "Leg" in French. This probably comes from "à la Diable", a term used for spicy recipes in French cuisine.
- When using Diable Jambe, Sanji assumes a stance and fights similar to the fighting style Muay Thai, which relies on strong direct kicks.