Koga Shinzo

Koga Shinzo is a Ninja who is out to accomplish the tasks of assassinations, messaging and abducting people(mostly women due to people paying high money) until one day he was challenged by Jake Kiba in a ground duel in chapter 5 of Yu-Gi-Oh! Omega.

Deck
Koga plays a Ninjutsu deck which focus on special summoning themselves from their owner's hand(Koga) and then activating their effects upon the summoning. Koga ace monster is Lord of Ninjas, Hitosumi which upon special summoning allows Koga to destroy all monsters on the field except for itself. But unlike other Ninjutsu monsters, Lord of Ninjas, Hitosumi must 

Trivia
Koga name comes from a region of Japan where one of the first few Ninjas were known. Shinzo is his family name and is actually Shinobi(without the bi and adding a z to the middle of the letters n and o).