4. Rory Williams
The Nose himself! Rory is one of the most hopelessly devoted companions that the Doctor has ever travelled with. His unwavering love and commitment to Amy is truly inspiring and if, for whatever reason, he were to transfer his feelings onto someone new, it's a certainty that his dates would be second to none. Clumsy and bumbling, Rory may not be smooth but what he lacks in natural charm and charisma, he more than makes up for with sheer passion and loyalty. If Rory gets a crush, you damned well know about it. If commitment's what you're after, Rory the Roman is your man.