I mean he was fascinating in that he never fell into any of the normal archetypes or dynamics as other killers. The guy was an only child, adopted, moved around a lot, no solid evidence of abuse. He seemed to be a case of a true natural-born psychopath, zero I mean ZERO conscience or even just regard for how people perceived his behavior. This guy tried to have the only living witness of he and Norris' atrocities murdered. I mean think of the sheer audacity of this guy: You're in a California prison for raping, torturing, and murdering teenage girls, and you still think that there's a possibility that one of these guys is gonna murder a child for you when they get out?
This guy had an IQ of 138, he was well-spoken and competent in some ways , but had the demeanor and behavior of an unruly child times a million, hopelessly addicted to breaking the rules way past the appropriate age. He doesn't even seem human, looking at the court videos and mugshots is like looking at a dog that got in trouble for tearing up the couch. This probably makes zero sense but yeah, he's interesting.
He's very different from Norris in that Norris was an easily mappable person, he was a candid sadist with an extremely deeply-rooted sense of misogyny. Bittaker didn't seem to have that, he just wanted to get his rocks off. I never got the sense that he was doing it out of hatred, I think he just wanted to be evil for the sake of it, to see how people would react. Real psycho shit, I've never read another case of that mindset. He's a very unique type of evil.