Spoiler for like, any book existing.
I think mine has to be the villain in Mirror Man. Idk, he wasn’t intimidating, he wasn’t interesting. He was meh.
Also the villains from The Chain. Dear God they weren’t sympathetic in the slightest. The book tries to act like they were atleast pitiful but FROM THEIR INCEPTION, they were just evil assholes who enjoyed causing pain. The book itself wasn’t all that great anyways.
For both most evil and least deserving of any sympathetic character arc it’s Snape
The guy was a teacher and a disgusting bully to little kids, became a nazi when he couldn’t get the girl he wanted was terrible to a little kid who lost both of his parents,and SO MUCH MORE, but Rowling still gave him his sympathetic villain arc at the end as if it excused any of the awful shit he did early on
Don’t you have it backwards? The guy became antifa because he couldn’t get the girl.