Emiri Thomas, also known as Emily, is a secondary character in the beach volleyball series. She is a second-year student at the same high school as the main protagonists and is the twin sister of Kurea Thomas. From a young age, both sisters excelled academically and athletically, and they have grown into a nationally ranked pair, holding the number two position in the country.

In terms of personality, Emiri stands in stark contrast to her outgoing and carefree twin. She is portrayed as serious, calm, and meticulous, often taking on the role of the responsible one. This personality extends to her school life, where she serves as a member of the student council. She is frequently depicted arguing with her sister, Kurea, trying to rein in Kurea's more impulsive and unconcerned nature. Her grounded demeanor also makes her a caring friend; she is notably concerned with the personal relationships and well-being of those around her, such as the complicated history between the characters Kanata and Narumi.

Emiri's primary motivation is closely tied to her partnership with her twin sister. Their dynamic on the court is built on a perfect division of labor that leverages their differing strengths. Emiri is the strategist and defensive anchor of the pair. While Kurea focuses on delivering powerful spikes, Emiri works hard on defense to keep the ball in play and set up her sister for the kill. Abroad, the pair known as the "eclair pair" represents a formidable obstacle for the main characters, demonstrating a level of synergy and skill that comes from a lifetime of playing together. Her role in the story is to serve as a rival, showcasing a different kind of partnership that is just as strong, if not stronger, than the main duo's. Her development is showcased through the team's matches, which test the unity and strategy of both sisters. She has blonde hair and blue eyes.