Shuuko Marukura (丸蔵 祥子 Marukura Shouko) is Marucho's father. He's a developer and makes millions by bulldozing homes to create vacant space, especially schools. He is a millionaire, and his wife, Kia Marukura, collects things such as art and endangered species. He has a factory that creates Bakugan wrist launchers made especially for the Bakugan Battle Brawlers, which his son is a part of. He is presumably the President and CEO of the Marukura Group.
Shuuko appeared in many episodes of the first series. He and his wife wanted their son Marucho to stop playing around and learn many tough subjects. Marucho did it all to make his parents happy until he started playing Bakugan and joined the Brawlers. He appeared again with his wife saying goodbye to Marucho when he and the other Brawlers decided to go to a portal that leads to the center of Vestroia.
In Back in Sync, he contacts Marucho and tells him to quit the Brawlers. He also knew about Dan and Drago leaving, how the Brawlers are falling apart and how Bakugan Interspace has become more chaotic. He originally wanted Marucho to give up brawling and work for the Marukura Group in order to fix Interspace. However, when Marucho decides not to, he accepts Marucho's decision after watching Marucho's victory against Jack Punt, saying how proud he is of his son.
He appeared again in episode 20 with Kato when they were trying to find any available access points in Bakugan Interspace. He also appeared to be concerned for Marucho again.