The benevolent and self-disciplined head of the Oak Family. In order to fulfill the promise made to his younger sister in childhood, he ultimately embarked on a path diametrically opposed to hers. He is the organizer of the Charmony Festival and a representative of The Family of Penacony. Sunday comes off as a dignified, benevolent, and rational individual. He is revered, seeming determined and just. However, beneath this, he possesses a twisted personality.