Most people want the readers to hate the villains, but the villains are always my favorites; they rich and dark backstories that you never get from the heroes life. Then again, if the hero does have a dark past, the villain usually has one even more so. Having a likable villain is probably the best thing ever; or writing a book that has neither a good guy nor a bad guy. When writing a book about baddies, you must include the following:
1. A SUPER (get it?) amazing and chilling backstory.
2. Normal life (like a hero's).
3. A home that suits the villain's personality.
4. Villain friends. (Most of you are probably wondering what I mean by 'Villain friends'. Well, if heroes can have teams then I think villains can have squads too.)
Anyway, the villain must have a normal life. They can't always been trying to take over the world; that's exhausting; therefore, make them have job, a family, and a pet. It makes the story interesting. Also, don't forget that the villain is most likely depressed, a sociopath, and probably a crazy person.
this is where i ramble; have fun