What they smell like: cologne/perfume, armor (leather, metal) and death.
How they sleep (sleeping position, schedule, etc): I doubt he sleeps much if at all, since DKs don’t really need sleep.
How much time they spend getting ready every morning: An hour, at least. You would not believe how difficult it is to get the blood off of everything. Not to mention everything else that has to be done to stave off rot/insects/etc…
Their favorite thing to collect: Cats.
Left or right-handed: Ambidextrous. It’s a combat advantage.
Favorite kind of weather: Anything cold.
The carnival/arcade game they always win without fail: The shell game.