Conversation so far:
What were some of Euronymous' beliefs?
In interviews, Euronymous claimed to be against individualism, compassion, peace, happiness and fun. He claimed he wanted to spread hatred, sorrow and evil.
Was Euronymous' extreme Satanic image all an act?
Some who knew Euronymous claim that the extreme Satanic image he projected was, in fact, just that—a projection which bore little resemblance to his real personality.
What was Euronymous really like behind the Satanic image?
Mayhem drummer Kjetil Manheim described Euronymous as health oriented ... A nice guy, a family guy.
What was Euronymous' personality like?
Mayhem drummer Kjetil Manheim described Euronymous as health oriented ... A nice guy, a family guy.
How else did people describe Euronymous besides health oriented ... A nice guy, a family guy?
Faust said that with Euronymous, there was a lot of smoke but not so much fire.
How was Euronymous extreme towards the end of his life?
Euronymous liked telling people that they were worthless; that he was the best. He was all 'I define black metal. Black metal is me!'“
How did Euronymous define the music genre black metal?
Euronymous said that the term black metal can apply to any kind of metal so long as it is Satanic and heavy.

Question: What else is interesting regarding Euronymous' beliefs?
Self-contained rewrite: What else is interesting regarding Euronymous' beliefs besides his extreme Satanic image and how he defined black metal?