"Addams Family". I'd be cousin Cousin September who "writes THOSE novels" (but the types of novels are never specified). She tends to carry a magic wand and has a carpet bag filled with a chemistry set for alchemical needs.
My other choice would be "Doctor Who" as companion Dorothy Willow: a Boston photographer and geek raised on a diet of sci-fi, fantasy, and history, and feels very comfortable knocking about the universe with the Doctor. Any version of the Doctor.
Of course, these are original characters. If I had to be me, I'd be in either "The Big Bang Theory" or "Sherlock".