The bad guy in the piece is Mok who is a mega rock star. He is clearly modeled on the glam rock stars of the age with some punk tossed in. He is a little David Bowie and a little Iggy Pop. He is also big making a magic theme part of his show. When he has less than amazing sales on an album he decides to punish the world by showing the real magic and opening a gate way to hell. To do this he needs a particular voice which apparently is Angel. One of the reason the movie did not due well is it was targeted to grown ups and in the early 80's Americans thought of animation as kids stuff for the most part. Characters used drugs, there was the suggestion of devil worship and more shockingly a suggestion of sex happening. Simply put the American distributors just didn't know what to do with it.
The movies story is not Shakespeare but it is not terrible. The animation is interesting and different. but really makes this one shine is the music. You got on the soundtrack by Cheap Trick, Chris Stein and Debbie Harry of the pop group Blondie, Lou Reed, Iggy Pop, and Earth, Wind & Fire. Good Stuff.
This little ditty is by Lou Reed and it is the bad guys egomaniacal theme song.