Yuzu Hiiragi is one of the main characters and a childhood friend of Yuya Sakaki in the Yu-Gi-Oh! ARC-V anime. She gives powerful pep talks. Her father owns You Show Duel School, the Duel school that she and Yuya attend, where they spend their time honing their Dueling skills. She functions as the straight man in comedy acts with Yuya.
Like Yuya, she also has dimensional counterparts: Serena (Fusion Dimension), Rin (Synchro Dimension), and Ruri Kurosaki (Xyz Dimension). She is also a reincarnation of Ray Akaba.
(Source: Yu-Gi-Oh! Wikia, edited)