9th doctor: He likes to call you "sweet" because apparently you're sweet.
10th doctor: he calls you "Red" because of your always red cheeks.
11th doctor: he calls you by your last name a lot he says he did it with his friends once and he's used to it.
Sherlock: He calls you Hun. Hun? What does that even mean?!
John: His warrior.. You secretly like it. But you say you hate it
Jim: Calls you Kit. Short for Kittens who always sneak around.
Dean: he calls you babygirl because you're his babygirl.
Sam: angel. Pretty self explanatory.
Castiel: Hunter. Also self explanatory.
