Luffy: average height. Black hair, black eyes. Lack of common sense. Fearless, blunt, bad at lying, child-like. Likes food a lot.

Zoro, has green hair, light tan skin, three identical golden earnings on his left ear. Stern, serious, distanced.

Sanji, slim muscular, blonde hair, curled eyebrows,
 Good at cooking. Kind, calm, cool, collected, flirt. Speaks in a composed manner, smokes a lot. 

Zoro and Sanji have a rivalry dynamic. Luffy is their boss/captain. they're a mafia gang.