Popularity rating: 35th

To most people, he's just an old man running a little medicine shop on the fringes of Infinity Fortress with his granddaughter. But behind the frail exterior, lies all the secrets of Infinity Fortress itself. The one who raised MakubeX and taught him all he knows about mathematics and computers, Medicine Man Gen is strongly believed to be the chief architect of Infinity Fortress and its core tower, Babylon City. Exiled by choice from his creation—which now seems to run on its own AI and virtual reality—Gen seems to be dealing with his guilt for helping create such a monster by assisting those (such as Kazuki and the GetBackers) who wish to unlock Infinity Fortress's secrets and open it up to the world.