In Tenchi in Tokyo, Katsuhito is not part of any line to Jurai's Royal Family. He is just the wise guardian of the Masaki Shrine. He also doesn't display any kind of special powers in the series, beside his skills as an exorcist. His personality is also less calm and collected then is previous versions. Near the finale, when Washu needed to go to Tenchi to warn him about Yugi, Katsuhito went with her. It is there that Katsuhito revealed to Tenchi that the Masaki family are Earth's protectors that secretly battle against any enemy that is a threat to the Earth and the gems that Tenchi received from his late mother are in fact the power that had been granted to them by the gods of the Earth and repel all evil.
Later, after Yugi began to freeze time and after Tenchi went to fight her, Katsuhito explained to Washu that Tenchi won't kill Yugi as he had preferred to be a kindhearted person which is why Washu and the other women from space are allowed to live on Earth in the Masaki Shrine. Katsuhito explained that through this method it enables for Tenchi to be true to himself and be able to fulfill his Planet Guardian duties. This proved to be true when Tenchi chose to spare Yugi.