This reminds me if what Tom Hiddleston said about Loki Every villain believes they are doing what's good, but not all definitions of good are the same. That's the only true way to write a villain or play one.
But seriously, the ones that don't get killed off would make for an intense sleepover. Draco Malfoy and Hermione Granger from Harry Potter, Eragon, Arya and Saphira from the inheritance cycle, Bilbo from the Hobbit...the list never ends. Although I'm not sure how I would fit a dragon (or two) into my bedroom