Aguri is composed, calm, and wise beyond her young years. She can be strict and expects others to follow the rules, so she can appear to be bossy and accidentally say hurtful things. However, she has an appreciation for good food, most notably sweets.

Spoiler

Cure Ace is Aguri's alter ego. Cure Ace represents love. As Cure Ace, Aguri has limited time to be in this form, five minutes at most.

Spoiler

One year prior to the season, Princess Marie Ange fell ill to a terminal disease. Only the Eternal Golden Crown, one of the Three Sacred Treasures, had the knowledge to save her. Desperate to save his daughter, the king of the Trump Kingdom stole the crown but was consumed by the evil and transformed into the Selfish King. Unable to fight her father, Princess Marie Ange broke her heart into two parts: The part that loves her father, which is her bad side, and the part that wants to protect her people, which is her good side. Ange's body was then transformed into an egg which would later be born as Ai. The good side of Ange's heart was reborn as Aguri and was sent to earth while the bad side went back to the Selfish King and was reborn as Regina.