Great Warrior is a powerful spirit warrior. A tall humanoid cat in black shogun armor whose details are unknown. He appears in Bad Bird Uncaged (Part 2) and The Big Comet Caper (Part 2). He lives inside the Supreme Catatonic of Mt. Chooice. He's the true creator of the Supreme Catatonic.
Also noted, if the series continued the creators (of the KNT) stated that he would return to be a mentor to the Nyankī (including Karamaru). He would tell them the real history about him and the robot. However, it never happened since the show only ran for one season and was canceled soon after.