Jock C is a secondary character in the anime Loner Life in Another World, also known by his full name Kurogane Natsuaki. He is one of the students transported from his high school class to a fantasy world. He belongs to the sports group of classmates, specifically identified as a member of the athletics club.

As part of the larger group of transported students, Jock C receives a unique set of abilities from the god who brings them to the new world. His role in the story is primarily as a supporting member of the class, with his actions and interactions contributing to the group dynamics that develop after their arrival. He is neither the protagonist nor a leader among the students, but rather part of the broader ensemble of classmates who must adapt to their new environment.

The character is voiced by Haruki Ishiya in the original Japanese version of the anime. In the English dub production, the character is voiced by Jovan Jackson.

The available information about Jock C from production announcements and character trailers does not contain specific details about his individual personality traits, personal backstory, character development arc, or unique abilities. His motivations and key relationships with other characters beyond his general affiliation with the sports group and athletics club are not detailed in the source material from the anime's promotional period.