Koutarou Matsudaira appears as a supporting character in the compilation film "Touch 2: Sayonara no Okurimono", which covers events from the "Touch" timeline. Within the film's narrative, he holds a minor role associated with the Meisei High School baseball team, serving as their catcher. He is consistently portrayed as the best friend of Kazuya Uesugi, with their partnership forming a key battery on the field. His physical traits include black hair styled in a buzz cut, prominent sideburns, and an overweight build.