King of the Monaco Just as it sounds, he is the king of Monaco (the 14th king, to be exact), Leonhart XIV. The lion-face is supposedly just a mask... it is later discovered that he is related to a certain world-class judge. (Thank you, type Bombay blood...)
	Brad Kid Kid is an old friend of Kuroyanagi's from high school. They were best friends, and did everything together, and Kid accepted Kuroyanagi as both super-intelligent and Japanese. Kid is now the head of a huge, successful corporation in America, and calls Kuroyanagi to lend a helping hand (well, helping information) at just the right time.
	Azuma Inaho Azuma's older sister, Inaho. Though she torments her brother sometimes, she wants the best for him and is very proud that he is such a skilled baker. She loves riding bikes, and has ever since she was very young.
	Yurich Rame The Chairman of the Monaco Cup, and Kirisaki Yuuichi's pawn. When he doesn't perform to Yuuichi's standards, he "commits suicide". (Or, if you go by the anime, he runs away to Russia.)
	Grandpa Umasaburou Azuma's other grandfather (the one he didn't live with). Is slightly senile, and believes his brother to be dead. Helps Azuma make the petalite board, and goes to heaven after eating Japan #44.
	Team Egypt Cleo, Muhammad, and the Pyramid, (aka Big Zam). Though they appear to be just another team in the Monaco Cup, they are really a police unit in disguise. Together, they help team Japan out of many a difficult situation.