Alma’s twin brother living in the Rarerare world, and one of Fealina’s twin children, Yuuma is also a student of the Winston Academy. He calm and nice, and sometimes helps Akari out in a pinch. He also likes basketball; he says so at one point while talking to Akari. His father died a long time and Fealina is in Eternal Sleep back in Jewel Land, with him living with his grandparents. Yuuma is shown to have a strange birthmark on his right arm similar to that of Alma’s, explaining that he and Alma once lived together and not knowing he’s a key on unlocking the Battest.
Akari has a crush on him, which he later accepts her as her girlfriend and also knows all about the Jewelpets, Jewel Land and Akari being a magician, and has promised to keep the origins of the Jewelpets in secret after she told him her secret.
In the Grand Prix Arc, he confessed to Akari that he loves her as she returned the love. Later on, with the help of Akari, Alma, and the other Jewelpets, he revived his mother, whom he and his sister now live with. In the OVA, he’s now Akari’s boyfriend and is now living with Alma and Fealina.