Master Carwes, also referred to as Meister Karwess, is the head of the Magician's Guild in the city of Ohfun. He holds the title of Head Mater of the guild, positioning him as one of the most authoritative figures in the magical community of that region. His most significant personal connection is to the protagonist, Louie, whom he has adopted as his son. This relationship places Carwes in the role of a foster father and direct superior to the often unruly magician.

In his youth, Carwes was an adventurer and a very powerful magician. This background is crucial for understanding his character, as he is not merely an academic administrator but someone who has practical, first-hand experience with the dangerous life his students aspire to lead. His role in the story is primarily defined by his relationship with Louie. As the guild master, he is responsible for Louie's education and conduct, a task that proves challenging given Louie's preference for physical brawls over disciplined spellcasting. As his adoptive father, Carwes has a deep, personal investment in Louie's future, which extends beyond mere professional obligation.

While specific details about his personality are not extensively detailed, his position and history imply a level of patience, authority, and seasoned wisdom necessary to manage a guild and raise a troublesome prodigy. His motivations are largely tied to the well-being and success of the Magician's Guild and, more personally, to guiding his adoptive son. The fan community has speculated about the depth of his relationship with the High Priestess Jenny, suggesting a possible past adventuring party connection that might provide context for his deep involvement in Louie's life. However, such speculation remains unconfirmed by official sources.