Sukihiro
Sukihiro, nicknamed 'Slick', perhaps more commonly known by his Kuroko alias, and twice called 'The Ump'1), acts as a referee in the Samurai Shodown series. He is a playable character in the Game Boy version, and a secret boss in some of the others.
He was forced into his role by Amakusa, who was holding his four brothers—he's the eldest of quintuplets—hostage.
Kuroko?
Kuroko is one of the names given to stagehands in traditional Japanese theatre.
See also
1)
in the Card Fighters Clash games.