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'''Aquos''' refers to the elemental power of water. Aquos [[Bakugan]] are typically themed around animals that exist in bodies of water, such as [[Krakenoid|octopi]], [[Juggernoid|turtles]], [[Sharktar|sharks]] and [[Elfin|frogs]].

In the Bakugan [[Legacy]] serties, '''Aquos''', {{nihongo|'''Aqua'''|アクア|Akua}} in the Japanese version, is the [[Attribute]] of water found on [[Bakugan]]. It exists in both the original system introduced in ''[[Bakugan Battle Brawlers]]''.