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The main protagonist of Buso Renkin, he is a 17 year-old teenage boy fighting against the Homunculus.
16 year-old-guy who attends Ginsei Private Academy along with his sister Mahiro. He runs in to Tokiko Tsumura who is fighting a Homunculus and dies in the battle. Tokiko uses a Buso Renkin to revive Kazuki. He then pursues this thinking it is a dream. He finds out that it is real and can use this to fight Homunculus just like Tokiko. He fights as a Alchemy Warrior throughout the manga against the main Antagonist Papillon, Koushaku Chouno, and various outher Homunculus.
PowersKazuki's Buso Renkin is called Sunlight Heart. It is in the shape of a massive sword and he uses it as a melee weapon. He can use a few specific powers with the sword as well. These include Sunlight Slasher, Sunlight Flasher, and Sunlight Crasher. They all have diffrent affects in the battle.