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}}{{nihongo|Kosuke|コースケ|}} is [[Takashi]]'s brother and friends with [[Makoto]] and [[MuiMiu]].

He taught [[Makoto]] how to play the game along with Takashi. When he sees Miu upset that she hasn't seen her brother in a long time, [[Masquerade]] tells him if he can defeat the Battle Brawlers, he will reunite Miu with her brother. He brawls [[Runo]] and [[Marucho]] alongside Takashi but relinquishes the [[Doom Card]] when Miu starts crying. They then play them again and lose, though they were glad they had fun. Miu then gives them both a kiss on the cheek for trying to help her. He brawls with [[Darkus (#Legacy)|Darkus]] Bakugan.

*[[Darkus (#Legacy)|Darkus]] [[Robotallion]] (Guardian Partner Bakugan)

{{Minor BB main characters}}