6. Melody Pond/River Song
The Mrs Robinson of the Doctor Who universe, River is certainly a fierce contender for most fanciable character of recent years. River is perhaps one of the most bafflingly intelligent characters seen on screen to date and as such, she would make for one of the most informative and interesting dates imaginable. Another companion, and Moffat creation, that's fiercely headstrong and astoundingly feisty, River wouldn't be content to take a back seat in any relationship (and her timey-wimey liaisons with the Doctor on screen can definitely vouch for that!) so be prepared to yield to her natural superiority on more than a few occasions. Spoilers, sweetie!