Saiki has pink eyes and long blonde hair with pink-colored tips worn down. His voice is bright and lyrical. Saiki is a cheerful, bright mood-maker who tries his best to never stop smiling. He enjoys fashion, and seems to take a liking to gyaru styles and subculture. Saiki wants to make up for his years of isolation, where he would often feel lonely and sad, by spending time with friends and writing music. Saiki and his sister both love theme parks and their attractions.