In the anime The Tatami Galaxy, Higuchi, whose full name is Seitarō Higuchi, is an enigmatic and eccentric older student who has been enrolled at the university for an unusually long time, often cited as his eighth year on campus. He is a memorable presence due to his peculiar appearance and demeanor, typically dressed in a simple navy-colored yukata, sporting a perpetual stubble, and having a distinctly bulbous or eggplant-shaped head. Despite his disheveled and carefree exterior, which can make him seem aloof or unconcerned with the norms of student life, he possesses a profound and often unexpected wisdom that many other characters recognize and respect.

One of Higuchi's most defining traits is his claim of divinity. He frequently proclaims himself to be a god of matchmaking, often citing his name as Kamotaketsunominokami or a similar variation, and expresses a vested interest in the romantic fates of those around him, particularly the protagonist, his friend Ozu, and Akashi. This claim lends him an air of mystery, and his actions and pronouncements often seem to carry a weight of cosmic or fated significance within the story's recurring timelines. It is never made entirely clear whether he truly is a god, but his character consistently fulfills a role akin to a wise, if eccentric, master or mentor figure.

Motivationally, Higuchi is driven by a complex mix of whimsical curiosity and a more profound, serene engagement with the world. He is the acknowledged master of the mischievous Ozu, who looks up to him and follows his guidance. In some episodes, the protagonist himself becomes a disciple of Higuchi, who then assigns his followers seemingly meaningless or absurd tasks. These errands, such as searching for a mystical tortoise brush, are framed as part of a "proxy proxy war" with the charismatic film club leader, Jougasaki, a conflict whose original purpose has been lost to time. This reveals that beneath his laid-back surface, Higuchi is an active, if unpredictable, agent in the chaotic social dynamics of the campus, manipulating events from the sidelines.

Higuchi's key relationships are central to his role in the narrative. He shares a significant bond with Hanuki, a dental hygienist and frequent companion, who is often seen in his company and is one of the few characters who will openly scold him for his behavior. His relationship with Ozu is that of a master and a devoted, if troublesome, disciple. Higuchi also forms a direct link with the protagonist, who moves into the room directly below him in the worn-down dormitory. This physical proximity mirrors his narrative proximity, as his schemes and declarations frequently pull the protagonist deeper into the story's bizarre conflicts.

Throughout the series, Higuchi does not undergo a dramatic personal transformation, but his role evolves from a background eccentric to a key player in the final acts. The persistent rumors of his long tenure at the university, his calm acceptance of his unusual lifestyle, and his multi-layered wisdom serve as a contrast to the protagonist's frantic search for an idealized "rose-colored" campus life. While he claims the power to influence romantic fates and initiates proxy conflicts, his most notable ability might be his serene detachment and the ambiguous, almost oracular, nature of his pronouncements, which forces other characters to question their own choices and perceptions of reality.