Katsuichi is an anthropomorphic lion samurai sensei who rejected the orthodox fighting styles to create a distinctive new technique. However, he soon abandoned his school due to his dissatisfaction with the poor quality students available.
Becoming a hermit near Miyamoto Usagi's village, he later had a confrontation with an arrogant gang of students from the rival Dogora school, witnessed by Usagi and his rival Kenichi which ended with a short battle where Katsuichi easily slew his attackers. Usagi was so impressed that he appealed to the lion to take him as his student, a request that was immediately refused. Only after Usagi waited outside his home day and night long enough did he convince the teacher that the rabbit was serious enough for him to change his mind.
