He is a wealthy, generous boy. He is the brain of the group. He loves to play Bakugan and work on strategies. He used to be extremely obedient to his parents out of fear, but that changed when he met the Brawlers. He now has no regrets for the past, realizing that he only wanted to make his parents happy. His Guardian Bakugan is Aquos Preyas. Marucho battle style revolves around his mind using it to predict and outhink his opponent. Preyas was sent to the Doom Dimension in Marucho's battle with Klaus Von Hertzon. Later Klaus shows up with Preyas. Dan and Runo find a way to get Preyas back through defeating him in battle. Preyas evolves into a two-sided Bakugan called Angelo and Diablo. Unlike the other Bakugan however, Preyas multiplies when he evolves, so Marucho got to keep the old Preyas. He is short and small. Preyas also has a move called "Change of Attribute" with which he can take advantage of the opponents gate card.