Fifty Five

No but imagine a SPN/Marvel fanfiction where Thor and Loki meet the Angels.

Paranormal twists are nice, but seeing ghosts isn't always a bad thing, so don't portray it as that.

V from V for Vendetta makes literary allusions to classics, not to Harry Potter, so don't ruin his character.

You're doing band fanfictions wrong if the band manager decides to make a random girl roommates with a band member.

Never use just one quote from your book to describe something. It is not the summary. It doens't give readers any idea what your story is about. Use a hook, not a quote.