Baki Hanma (範馬 刃牙, Hanma Baki) is the main character and protagonist of the Baki the Grappler franchise. At thirteen, he decided to take his training into his own hands to perform more intense training in his father's footsteps. He later aims to defeat him. Baki first fought in the no-rules arena at fifteen and went on to become its champion. He is the son of Yuujirou Hanma and Emi Akezawa and the half-brother of Jack Hanma.

He is known as the "Champion" (チャンピオン, Chanpion) of the Underground Arena in Tokyo Dome. In the fourth manga series, he is often called "the World's Strongest Boy" (地上最強のガキ, Chijō Saikyō no Gaki).