Aceto is a young girl who has long, chestnut-colored hair which reaches her mid-back, with short bangs in the front. She has large, pink eyes, and normally wears a pink dress. For the Magic Dance Ball she wore a white, fancy dress with a purple dressing in the front of it. She also tied part of her hair in a bun.
Aceto seems to be very kind and gentle. She also seems to be very traditional as she was okay with the custom of her future husband grabbing the Balsamico Ring to propose to her.
When she was young, Aceto had a friendly relationship with Velveno who served for the Balsamico family and later fell in love with her. Due to this, her father, Balsamico, drove Velveno out of the mansion and only allows his daughter to make public appearances in her family's Mage Dance Ball at the Balsamico Castle once every seven years with a sole purpose of finding a suitor for her.
Key of the Starry Sky arc
Note: Events in this arc occur only in the anime and do not constitute canon material.
Aceto invites a group of Fairy Tail Mages —Team Natsu, Wendy Marvell, Carla, Warren Rocko, and Elfman Strauss— inside Balsamico Castle upon hearing that they have come at the request of her father, Balsamico, to deal with the escaped convict Velveno. The count explains his family's tradition of deciding Aceto's future husband by holding a ball and leaving the Balsamico Ring out for her suitor to take. The count tells them Velveno has been wanting to steal the ring, which is why he wants him stopped.
Aceto appears at the ball, but nobody asks her to dance as all the men find her too beautiful. She goes up to Erza Scarlet, dressed as a prince, and dances with her. Velveno soon reveals himself and successfully takes the ring. After fighting off the Fairy Tail Mages, Velveno tells them that he had only come to propose to Aceto, revealing his true feelings to her. He explains that he turned to crime because Aceto's father refused to let him pursue a relationship with her, and broke out of prison for a chance to confess his feelings. Moved by his actions, Aceto accepts Velveno's proposal under the condition that he turn himself in for his previous crimes. Velveno agrees and is taken away by the Rune Knights, but the two promise to wait for each other.
- Aceto's name is Italian for "vinegar". Combined with her family's name, "Balsamico", her name would mean "balsamic vinegar", an aromatic type of vinegar known for its mellow flavor caused by a mixture of tartness and sweetness.