Mitsunori Kugayama possesses a heavyset frame and a noticeable stutter. His features include buzzcut black hair, squinted eyes, and a large nose. Exhibiting poor motivation and significant social difficulties, he finds interactions challenging. As the Genshiken club's sole artist before Chika Ogiue's arrival, he consistently struggles to complete projects, notably failing to produce a commissioned doujinshi for Comic-Fest despite Sasahara's request, causing friction due to this pattern of starting but not finishing work.

A turning point arises when Saki intervenes, compelling him to collaborate with Ogiue and Sasahara under extreme time pressure to meet the Comic-Fest deadline. During this intense period, Saki assigns him the enduring nickname "Kugapii." While initially perceived as a mediocre artist, he possesses significant latent talent. His artistic skill surfaces most prominently when drawing erotic content, especially depictions of the character Yamada from *Kujibiki Unbalance*, revealing a stark contrast between his typical output and his capabilities when properly motivated.

Following graduation, he secures employment at a medical device manufacturing company in Iidabashi. His involvement with the Genshiken club diminishes significantly after joining the workforce, becoming infrequent. His legacy within the club remains defined by his technical ability undermined by the chronic incompletion of tasks, particularly regarding deadlines for comic festival submissions.