Kajii is as explosive as his lemon bombs. An eccentric, easily excitable man with an intense obsession over science and a lemon's shape. He has a habit of talking in an odd sort of "code" centered on the universe, referring to the Port Mafia's boss as the "Grand Marshal of Outer Space". Kajii seldom stops exclaiming his every word, and when he's not, he's mocking his adversaries or waxing lyrical of his intelligence.