First, stop using 'literally' as an intensive. Second, Darth Vader is a cartoonish Big Bad --scary, scary! -- but not something so adult you have to be at least 16 to be able to understand. A nice science teacher who makes blue candy that makes people feel good which is actually really, really bad for them and killed a lot of people because he was really a baddie himself because he was sick all the time...no, guys. That's just stoking your own ego. You're dressing the dog as Cerebus and inviting the neighbors to applaud the fact you read Dante.
It's not funny, or appropriate. I wouldn't dress them as Iggy Pop or Lou Reed, either, even though I love both of them dearly. Stick to duckies and bunnies and kitties, please.