He is a member of Port Mafia. He is an explosives expert and has the ability “Lemonade” prevents him from being harmed by any lemon-shaped bombs, which he makes himself. Kajii is as explosive as his lemon bombs. An eccentric, easily excitable man with an intense obsession over science and a lemon's shape. For all his eccentricities, Kajii is an accomplished and seasoned science enthusiast. Kajii prides himself as a scholar of physics, applying science to every aspect of his life.