Aqua is a charming girl adorned in a sea-themed ball gown. Despite being a member of the Chess Pieces, the cheerful and somewhat unpredictable Aqua always maintains a smile on her face, much to the surprise of Team MÄR. In the Japanese version, Aqua addresses everyone with honorific suffixes, while in the English dub, she uses "Mr." or "Miss" before everyone's names, including her own.
Aqua appears in the 3rd round of the 4th Battle. After witnessing several examples of how Rapunzel executes any losing Chess Pieces, Nanashi and Aqua engage in combat. Nanashi defeats Aqua using his Electric Eye. However, he pretends that the attack drained all his energy to make the fight a draw and save Aqua. Although Rapunzel isn't pleased with this outcome, Aqua wins a game of Rock-Paper-Scissors against her, sparing her life momentarily. Instead, Rapunzel has her brother Girom kill Aqua. Aqua's final words are an apology to Nanashi.
After Rapunzel is defeated by Dorothy, Nanashi gives Aqua a water burial. Her character is inspired by The Little Mermaid, and she wields sea-themed ÄRM.
