Leon, also known by the Chinese name Li Wen, is a seventeen-year-old male character from the anime True Cooking Master Boy. He has lilac hair and grey eyes. Originally introduced as a member of the Dark Cooking Society, he first appears at the Yang Spring Restaurant demanding one of the Legendary Cooking Utensils, claiming he is entitled to it. He is known as the Leon of the Seven Stars, a reference to his possession of the legendary Seven-Star Knives, a set of knives forged by the renowned knife maker Luo Xie.

His background reveals a complex and tragic history. As a young boy, Leon worked as a cook at the Yang Spring Restaurant and was a natural genius in the kitchen, much like the protagonist Mao. He was also kind-hearted; he disliked killing animals and would place a red paper talisman on any creature he had to cook, praying for it. Driven by a desire to learn more and improve his skills, he left the restaurant and traveled across China. When he could not find any further challenges, he joined the Dark Cooking Society to learn their forbidden techniques. While with the organization, his knife skills progressed to an unreachable level, but he also became corrupted and obsessed with becoming the greatest chef. He sought out Luo Xie, the finest knife forger in China, and commissioned the Seven-Star Knives. When Luo Xie declared that he would one day create an even better set, Leon, enraged, stabbed him and caused him to fall from a cliff. This act traumatized Leon and eventually led him to turn against the Dark Cooking Society. Unable to reconcile with what he had done, he realized he still loved cooking for its own sake and chose to defect. He revealed the truth to Mao and the others, confessing that he had betrayed the Dark Society and had come to reclaim his genuine passion for cooking.

Leon is also revealed to be another successor to the Ever-Soul knife, a legendary blade. His primary culinary specialty is seafood, and he can prepare such ingredients to their utmost potential thanks to his superior knives and the skills to wield them. Throughout the story, Leon joins Mao and his friends on their journey to collect the Legendary Cooking Utensils, aiming to prevent the Dark Cooking Society from seizing them. His role evolves from a dangerous antagonist into a loyal ally and a skilled mentor figure for Mao in the art of knife work. His personality shifts from cold, ruthless, and single-minded to more reserved, introspective, and driven by a desire for redemption. He is fiercely loyal to those he cares about and brings a solemn but determined presence to the group. His development centers on overcoming his past mistakes, rediscovering the joy of cooking, and learning to use his talents in service of others rather than for personal glory. His key relationships include his rivalry and eventual friendship with Mao, his painful history with the knife forger Luo Xie, and his uneasy break from the Dark Cooking Society.