Jun appears to be a young child compared to the rest of his classmates. However, despite his size, he plans to become a professional stunt artist and "extend beyond his regular talents," which most likely refers to his role as the SHSL Carpenter. He often tries to call himself cool, but he seems to be doubtful of it himself, which leads him to ask Hiroto this question often. However, despite his doubts in himself, he explains that he's "going to gain talents beyond what he already has, and never let anything hold him back."