Opal is a Jewelpet and one of the main characters in the anime Jewelpet Sunshine. She appears as a winged unicorn with a blue body, a purple mane and tail, and a yellow horn, and she wears strings of colourful beads on her wings. In the lore attached to her character, she is considered one of the most powerful Jewelpets in Jewel Land and is associated with hidden talent, awakening, and miracles. Legend holds that she once restored Jewel Land a thousand years earlier, after the land had become a barren and war-torn place, and that she banished evil and dark magic from the world.

Within the story of Jewelpet Sunshine, Opal is a student at Sunshine Academy and serves as vice-captain within the school setting. Her personality contrasts sharply with her grand legend, as she is portrayed as timid, kind, and prone to crying, while also being insecure yet determined. Her emotional fragility is tied directly to her physical form, as it is revealed in the series that her wings will turn black and shrink if she suffers too many wounds to her heart, meaning her inner pain has visible consequences. Her role in the story centres on her school life and her efforts to move forward despite these vulnerabilities.

Her most significant relationship in the series is her crush on Jasper, a fellow Jewelpet, which adds a romantic dimension to her characterization. Her development over the course of the story revolves around coping with the emotional wounds she carries, especially given the direct link between her state of mind and the condition of her wings. In terms of abilities, Opal draws on the immense magical power tied to her legendary origins, with her defining accomplishment being the restoration of Jewel Land and the banishment of dark magic in the distant past.