Ichiroubei Hiiragi

Professor Hiiragi is a mad scientist who found a way to enter the Sixgate World, and the father of Rokuna. He recruited her and Mondo to protect him as he searches the Sixgate world for the items that will connects its magic to the human world, so that he can become famous. Generally he takes rules and morals a tad more loose than his companions and he's rather obsessed with finding the items.

Related anime:

Mon Colle Knights TV, 2000
Gekijouban Rokumon Tengai Monkore Knight: Densetsu no Fire dragon Movie, 2000

Related manga:

Rokumon Tengai Mon Colle Knights Manga, 2000

Voice actors:

Shigeru Chiba, Japanese
Jamieson Price, English
Gadi Levy, Hebrew