Katsumi is a tall, cool, laconic, and gifted athlete, who is much gentler than his looks might suggest. Though he usually has a stern face and doesn't speak much, he has a very kind heart and goes out of his way to help those in need. He also condemns violence and he can't help but look out for other people. He is very athletic and loves watching and playing sports, especially baseball. His hobbies are exercising and afternoon naps. He is respected for his athleticism and is loved by animals.