Bosskatsu

Bosskatsu is a hamster form of Bosskatsu, Number 2 Man, a Revolutionary creature spirit. He was one of Katta Kirifuda's creature partners along with Hamukatsu.

Before the series
Some time before VSRF, Bosskatsu was tasked by Katsudon to protect Katta Kirifuda if he ever removes his plaster on his forhead in which where 'Victory Mode' used to activate. He was given a card frame which allow an animal to become a creature.

Duel Masters Versus Revolution Final
When Katta removes the plaster on his forehead, Bosskatsu who acts as a regular pet hamster sensed Katta's presence. He leaves the hamster cage and brought the card frame along with him. He manages to push Hamukatsu out of Katta's hair and toss the card frame right on top of Hamukatsu. As the task of fusing Hamukatsu with the card was successful, he left the scene quietly without being noticed.

During Katta's first duel against a member of the Rare Killers, he slipped into Katta's deck without being noticed before the deck was shuffled. Katta eventually draws him, much to his surprise as he was originally not in his deck. He eventually give a strategy for Katta to summon Hamukatsu, who was now in his card form as Hamukatsuman, Number 1 Breeze and attack his opponent's ace creature despite its power being greater than Hamukatsu. Bosskatsu reveals his true intention is to activate his Revolution Change ability to swap places with Hamukatsu, allowing him to destroy the creature. With his help, Katta was able to secure a win.

Card Representation

 * Bosskatsu, Number 2 Man