It's the same with Nabeshin, who has appeared in several anime series, including Excel Saga. Nabeshin openly states he is GDW, the Great Director Wantanabe. He is a self-insertion of Shinichi Wantanabe, an actual anime director. Which is why, as the Director, he can do whatever he wants. Basically, he's TOAA. Which is what makes Excell Saga so funny, as Koshi Rikudo, being the creator behind Excel Saga (thus TOAA of Excel Saga), is constantly being beat down and abused by Nabeshin, and at the end of the series they have this whole dramatic final battle type scene where they flying-kick at each other and it just freezes, and series ends.