Aqua is a bumbling airhead who somehow manages to become the victim of every joke in which she gets involved. She is also childish and prone to throwing tantrums, smashing her keyboard, and hyperventilating when things don't go as planned (which is most of the time).

She is a virtual maid who wears a marine-themed maid uniform and a white mob cap decorated with an anchor though it has also been described as a "tissue box." Despite her name and appearance, she has nothing to do with water.