Aqua (voiced in Japanese by Megumi Toyoguchi and in English by Willa Holland) is one of the main characters of Birth by Sleep, and a prominent character in the Kingdom Hearts game series as a whole.

She is part of the trio of trainee keyblade wielder under Master Eraqus, and a major plot related reoccurring character continuing on into Kingdom Hearts 3.

Aqua has a predominantly blue color scheme, with her hair and eyes both in similar shades. She wears a sleeveless black turtleneck like the other two, with a underbust corset over top, and a pinkish lavender x strap over her chest, clasped with a silver wielder symbol. She also wears grey fingerless gloves, with white half sleeves over them, topped with her keyblade armor summon bits. Tying into the blue colors, she also wears a white and blue waist drape sash on top of a pair of black short shorts, finished off by black thigh high socks, and silver spiked boot pieces.

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