Nika Aoi is a recurring character in the anime and manga series Beyblade Burst. She is the younger sister of the main protagonist Valt Aoi, the twin sister of Toko Aoi, and the daughter of Chiharu Aoi and Kento Aoi. As a young schoolgirl, she has pink hair and orange eyes, and is almost always seen with pigtails held up by star‑shaped hair bobbles. Her current Beyblade is King Kerbeus Knuckle Unite.

In terms of personality, Nika is cheerful and supportive, often cheering for her older brother during his matches. She is notably confident in her own abilities as a Blader, but can also become emotional and burst into tears when she loses a point, though she quickly recovers. She and her twin brother Toko are rarely seen apart; they share a close, inseparable bond and do almost everything together, from visiting friends to attending school.

Nika’s motivations center on her love for her brother and her enjoyment of Beyblade. She occasionally participates in battles and is shown to be a capable Blader in her own right. As the series progresses into later seasons, she matures and takes on a more analytical role, often using a tablet to study and analyze matches instead of actively battling. She is also known to train at Beigoma Academy, helping younger Bladers develop their skills.

Within the story, Nika serves as a supportive family figure who reinforces the importance of family and friendship. Her relationship with Valt is especially important; she looks up to him and is a constant source of encouragement. Over time, she grows from a small child into a more composed and observant character, demonstrating personal development while remaining a warm presence in the series.