The phrase "book villains" refers to the bad or evil characters found in books. They are the ones who create obstacles and challenges for the main characters. Full definition
She offers a fresh and frightening take on the comic book villain in this underrated genre classic. (lwlies.com)
He's a comic - book villain in an otherwise grounded universe. (southflorida.com)
If Justice League has any flaws it is that the major villain of the film Steppenwolf (while not the worst Comic book villain of all time) is just a villain of the week. (slickstermagazine.com)