For more information, see these previous Undead Brainspasm articles and these Undead Backbrain ones: here and here.
Meanwhile, here's some pics of veteran actor Tsunehiko Kamiziyou in the studio with the "Demon God", giving him a voice through some post-production dubbing. Hard to say how pleased Daimajin is. He looks a little grumpy.
And believe it or not, here's one of the Big Guy's co-stars: