**Kōhei Matsuda** serves as a manager at Sendai's Green Leaves Entertainment. Originally moving to Tokyo for college to become a recording artist, setbacks forced his return to Sendai.

In appearance, Matsuda is a fair-skinned young man with short gray hair and gray-blue eyes. His typical attire consists of a white long-sleeved shirt, blue tie, and slack trousers.

Personality-wise, Matsuda has a good heart but a timid demeanor. His inexperience as an idol manager often impedes effective decisions for advancing the group's career. Despite this, he genuinely cares for the girls he manages and steps in when they encounter uncomfortable situations. His background includes past experience playing guitar.

Matsuda's plot involvement starts when Green Leaves Entertainment faces imminent closure after losing its last client. Under the directive of the agency's brash president, Junko Tange, he is tasked with scouting talent to form the new idol group, Wake Up, Girls!. This scouting proves haphazard and initially lacks direction, leading Tange to take a more active role in finalizing the lineup. His early management struggles include navigating financial instability, such as the president's temporary disappearance with company funds, and handling shady business proposals to secure opportunities for the group.

Across later media, including the sequel "Wake Up, Girls! New Chapter!", Matsuda continues as manager. He collaborates with Tange to tackle professional challenges, such as resolving scheduling conflicts for WUG's national tour when a virtual idol group threatens their planned Sendai Stadium performance, demonstrating his professional development through active participation in strategic problem-solving.