Ai Saeki is a main character in the anime series Fault!!. She is a talented and dedicated athlete known for her exceptional skills in volleyball. Ai is highly motivated and often pushes herself to be the best, which sometimes leads to conflicts with her teammates. Despite her competitive nature, Ai cares deeply about her friends and works hard to maintain team spirit. Her journey in the series revolves around overcoming personal challenges and growing both as a player and a person, making her an integral part of the storyline.