Marucho Marukura

Gender: Male

Main Attribute: Aquos

Guardian Bakugan:

• Preyas (BB & NV)

• Angelo/Diablo Preyas (BB)

• Minx Elfin (NV)

• Akwimos (GI)

• Infinity Trister (MSA1)

• Radizen (MSA2)

• Roxtor (MSA2, Temporarily)

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 to work on strategies. He used 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, though Kato is not usually around Marucho anymore, due to the fact that Kato is now working for Marucho's father.

In the Japanese version, Marucho speaks in a polite and formal keigo accent, thus putting honorifics in his speech and uses honorific suffixes when addressing a character's name, such as Dan-san and Drago-san.

His Guardian Bakugan is Aquos Preyas, who crashed Marucho's house party, which was thrown after he moved into Dan Kuso's town. He and Dan battled the JJ Dolls who were under the control of Masquerade. He and Runo Misaki later battled Takashi and Kosuke who wanted to see their friend see her brother again. Despite the odds they managed to win.

After Dan becomes unconscious during a battle against a Ventus Brawler, he and Runo decide to recruit Shun Kazami to the team since they think he will be a big help. The two of them find Shun's House and battle Shun only to lose to him. Dan gets mad after finding out what they did and manages to get Shun on the team. Later he watches Michael Gehabich's video before he left for Vestroia and then travels with them to Bakugan Valley

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 and watches Dan and Runo battle Julio Santana.

Later, when Klaus shows up with Preyas, Dan and Runo Misaki use the ability Pure Light to win Preyas back and beat him, Chan and Julio freeing them from Masquerade. Preyas evolved into a two-sided Bakugan called Angelo and Diablo by coughing them up. Unlike other Bakugan, Preyas multiplies when he evolves, so Marucho got to keep the old Preyas and the new one.

He watches Dan's match against Masquerade and gets upset when Dan gets sent away. He, Shun, Runo and Julie then device a plan to save Dan. They battle Masquerade and lose to him on purpose to find Dan which they do.

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 and lost to Dan.

When he was in Vestroia he fought Aquos-Ventus hybrids Tayghen and Hairadee alongside Shun. He originally just fought Tayghen but then they teamed up when they realized that they were both able to use both Aquos and Ventus. He then defeated them by using a Diagonal Relationship with Ventus and Haos with Angelo and Skyress, and then a Pyrus and Darkus with Preyas and Diablo, defeating them. He later brawled against Tayghen once again alongside the JJ Dolls Jenny and Jewels and defeated it. He, Julie, Billy, Komba, Julio and Klaus later aid Dan and Runo in their battle against Centorrior and Druman eventually beating the hybrids. He, Runo, Shun, Julie and Alice later help Dan and Drago to defeat and destroy Naga with their Bakugan's help. After the battle finished, he released Preyas and all other of his Bakugan.