Sanji, born Vinsmoke Sanji, serves as the cook of the Straw Hat Pirates and a disowned prince of the Germa Kingdom. Subjected to genetic modification as a child by his father, Vinsmoke Judge, to erase emotions, his humanity survived due to his mother’s sacrifice. After enduring abuse from his siblings and imprisonment, he fled Germa with aid from his sister Reiju, severing all familial ties. Stranded in his youth with "Red Leg" Zeff, Sanji mastered cooking and martial arts, crafting the Black Leg Style to shield his hands. This kick-centric combat evolved with techniques like Diable Jambe and Ifrit Jambe, fueled by friction and Haki to unleash searing flames. His ethics, forged by near-starvation with Zeff, bind him to feed the hungry and never strike women, even at personal cost. Though prone to comedic obsession with women, Sanji balances this with tactical ingenuity, exemplified by outwitting Crocodile through disguise and unraveling CP9’s schemes. His loyalty drives solo sacrifices, from sealing the Gates of Justice to confronting the Vinsmokes. Struggling with Germa’s legacy, Sanji reluctantly activated his latent genetic enhancements via the Raid Suit in Wano, gaining an exoskeleton and heightened strength. Fearing loss of empathy, he destroyed the suit and tasked Zoro with killing him should he succumb. Post-timeskip, he honed Observation Haki to evade attacks and Armament Haki to amplify strikes, perfecting Ifrit Jambe’s blue flames. The Whole Cake Island arc exposed his mother’s death to nullify Judge’s experiments and his coerced engagement to Charlotte Pudding. Despite betrayals, he thwarted his family’s assassination, upholding Zeff’s teachings over Judge’s tyranny. In Wano, defeating Queen affirmed his rejection of Germa’s legacy while leveraging their science to protect allies. His quest for the All Blue—a mythical sea uniting all oceans—fuels his journey, symbolizing his belief in food as a bridge between cultures. Crew dynamics, from rivalry with Zoro to devotion toward Nami and Robin, showcase his duality as warrior and nurturer. Lingering genetic modifications hint at future evolution, such as invisibility or enhanced traits, framing Sanji as a fusion of emotion and engineered power, battling to preserve compassion amid escalating strength.