Saika Totsuka attends Sobu High School in Class 2F, serving as both president and captain of the Tennis Club. His parents named him "Saika" hoping his life would add color to others'. He possesses a strikingly feminine appearance with short silver hair, blue eyes, and fair skin, often leading to him being mistaken for a girl despite his preference to be recognized as male. He is frequently seen in his tennis uniform: a green jacket, shorts, and V-neck shirt, complemented by a black bracelet on his right wrist. Kind, gentle, and peaceful, Saika avoids conflict and fosters harmony. He forms genuine friendships easily, notably with Hachiman Hikigaya, whom he met in their first year (though Hachiman initially forgot their shared class). Saika enthusiastically greets Hachiman with "Hachimaaaaan!" and is one of the few with his contact information. Their friendship includes activities like visiting an arcade, where Saika's appearance gained them access to a couples-only photo booth. As Tennis Club captain, Saika demonstrates dedicated leadership, practicing intensely during breaks and after school. He motivates his team effectively, leveraging his "cuteness," particularly evident during events like the Athletic Festival's Bo-Taoshi. Witnessing a tennis match involving Hachiman, Yui Yuigahama, and Yukino Yukinoshita against Hayato Hayama and Yumiko Miura deepened his commitment to improving his skills. He also assists the Service Club with requests, such as helping Taishi Kawasaki aid his sister, though he was once excluded from an activity for lacking formal attire. Saika participates in school events like the Cultural Festival, acting in a yaoi play organized by Hina Ebina. Female classmates often call him "The Prince" due to his popularity and appearance. Beyond tennis, he enjoys horror movies, haunted attractions, and has a fondness for rabbits. His skin is sensitive to sunlight. Appearing across all seasons and media, Saika remains a consistent, supportive figure. His role evolves from a club captain seeking help to an unofficial participant in Service Club activities, reflecting his willingness to support others without seeking recognition.