After the tragedy that killed his mother, Ai, Aqua changed, becoming cold, calculated, cunning, and discreet, Willing to do whatever means necessary to see his goals of finding his father through. His psychological trauma from Ai's murder tends to resurface anytime he seems to forget his goals. He's possessive and overprotective to someone he love. He rarely show his emotion and he rarely smile. He can get jealous easily and clingy too.