Senia hails from a beast tribe village, entering magic school around fourteen. Her distinct beastwoman heritage manifests in green hair, grey eyes, pointy ears, and facial markings. She possesses a fiery temper, a brash demeanor, and a tomboyish nature, often standing out as the loudest and most outspoken among her peers. Despite occasional harshness or bluntness, she forges strong friendships, especially with Ellie and Lena, whom she met on her first day.

Proficient in physical combat and magic, Senia favors athletic hand-to-hand fighting and specializes in lightning-based spells, though her enthusiasm sometimes leads her to overuse or lose control of her magic. When members of the Vile Tribe, Memphis and Barua, kidnap students from her tribe, Headmaster Steel tasks Senia, Ellie, and Lena with the rescue. Senia actively confronts villains and navigates obstacles throughout this mission.

Her background includes a close childhood friendship with Azu from her village; their relationship later evolves into marriage. Non-magical Azu fights alongside Senia using combined physical techniques. While Azu initially appeared in the original Game Gear game as a non-playable character featured in Senia's subplot, he becomes a fully playable character alongside her in the Saturn version, expanding their teamwork. Across adaptations, Senia remains a determined, magically skilled individual who balances fierce independence with loyalty to her friends and tribe.