Chouji Marukura

Attribute: Aquos

Guardian Bakugan: Preyas, Elfin (Dual Elfin), Angelo/Diablo, Akwimos, Tristar

11(Bakugan),and believed to now be about 14

For an eleven year old, Marucho is wise beyond his years. Studious, he studies the strategy of Bakugan as well as being a bit of a walking encyclopedia. Marucho is the only son of a millionaire. In the Bakugan battles, Marucho devises strategy based on in-depth data analysis but sometimes misjudges his spur-of -the-moment decisions based only on data. As a sidekick to Dan, Marucho helps work out which Bakugan would be best to pit against one’s opponent. He worries about all of the Brawlers, but especially Dan. Marucho is a master of combination play, and uses water attributes in battle.

He is a wealthy, generous boy who specializes in Aquos. He is the brain of the Brawlers, a real walking encyclopedia. He loves to play Bakugan and work on strategies. He use to be extremely obedient to his parents out of fear, but that changed when he joined the Brawlers, however he is still very obedient. He now has no regrets for the past, realizing that he only wanted to make his parents happy. Marucho has a butler named Kato.

His Guardian Bakugan is Aquos Preyas, which he obtains when Preyas crashes his house party, which was thrown after he moved into Dan's town. Preyas was sent to the Doom Dimension in Marucho's battle with Klaus Von Hertzon which made Marucho want Preyas back so much that when Klaus opened up his portal, Marucho followed him. Later, when Klaus shows up with Preyas Dan and Runo find a way to get Preyas back by using the ability Pure Light. Preyas evolved into a two-sided Bakugan called Angelo and Diablo by coughing them up. Unlike the other Bakugan however, Preyas multiplies when he evolves, so Marucho got to keep the old Preyas. He multiplied into Angelo/Diablo Preyas. Preyas also has a move called "Change of Attribute" with which he can take advantage of the opponent’s gate card. When Marucho was being tested by Frosch he had to fight an old version of himself, the one who always listened to his parents. This sickened him but he was able to accept his past and how it made him who he is today and passes the test. When he brawled against Dan with Preyas and Angelo/Diablo Preyas he was ranked seventh. Preyas Angelo/Diablo are not in New Vestroia.

Marucho returns in New Vestroia, following Dan and Drago into the new world. When the Vexos attack first against Dan and Mira, he stands back and observes the new way of battling.