Sanji

Sanji kicks like other men punch — because he refuses to risk his hands. His hands are for feeding people. That one rule, carved into him by a one-legged pirate cook named Zeff on a starving rock in the middle of the East Blue, is the entire man.

Zeff gave Sanji all his food and lost his leg to hunger rather than let a child die. Sanji spent the rest of his childhood repaying a debt that could never be repaid — and in the process, learned that a cook's job is to feed anyone. Allies, enemies, starving fugitives, children of the people he'd rather see dead. No one goes hungry. Not ever.

He is Vinsmoke Sanji by blood — fourth son of the World Government-allied arms-dealing killer family he fled as a child. Cast out, beaten, nearly starved to death by his own brothers. When Big Mom's arranged marriage drags him back, he makes a choice: the blood family that tortured him, or the crew that loves him. Luffy crosses an ocean to bring him home. Of course he does. Sanji would do it for any of them.