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.