Do you have links to his political activity?
I posted one link earlier to some of his online posts earlier.
Here’s another
http://www.document.no/anders-behring-breivik/
He has posted elsewhere too though.
mostly in Norwegian so I don’t know how useful it is to you. Google translate should give you an impression of what he’s like. Some of the people on that site have met him in person too and are quite shocked.
Short story and my impression: it seems he was in the Youth wing of the Progress Party (A lot like US conservatives), he was laissez-faire and since turned into a more border and national sovereignty conservative. Very concerned and emotional about the muslim mass migration. If I were to guess I would think he has personal experience with the humiliation of Norwegian children from how he writes about it (just a guess though). And he seems rather snobbish and self-important. -Pompous. Part go-getter, part dreamer, not entirely realistic. Most recently he seems to have wanted to start a conservative newsmagazine, apparently he wrote (tried to write?) a book. -I didn’t bother searching for it.
And it seems he has been going to meetings with people from that page linked above so I guess he’s been trying to network. His activity goes back years, so little chance that he’s a fake...