Oona is a sweet, sincere, sensitive, and gentle little girl who's empathetic and aware of other people's emotions. Sensitive, Oona would be the most likely to show concern for a sick friend, to notice when someone is feeling down, or to give loving care to a pet or a plant. Her best friend is Deema, and they frequently play together. When not around Deema, Oona usually likes to hang out with Nonny, and sometimes Goby.
She has a great amount of empathy, meaning when someone is sad or unhappy she feels the exact same way.
Oona has light tan skin and brown eyes. She has amethyst purple hair that is worn in low pigtails with pink ties. She wears a pink star-shaped accessory in her hair. She has a purple tail with wavy pink stripes. Her body is slightly thicker than the other guppies'.She is the only guppy to have almond shaped eyes, along with Zooli. At first glance, Oona's skin looks white, but when compared to Deema and Nonny, her skin looks quite yellow. Oona is the most different out of the girls. She wears her hair in pigtails, while Molly and Deema wear their hair without accessories. She also appears to be wearing a one-piece suit, unlike the other two girls, and her eyes are almond-shaped.