As far as making a great anime character:
The video game Terranigma features an insane geneticist named Beruga, who, under the direction of Dark Gaia, an evil overlord buried deep in the earth, designs a plague called Asmodeus to control the world's overpopulation. I wonder if the designers of Terrangima were making this reference to Xenu\Xemu on purpose, or whether Scientology is just based on the same sci-fi cliches that, while making a good video game, make a lousy religion.