Again, all together because it's going to be short.
Bruce: Toots. he just said it one day, and it stuck.
Bucky: Doll, because he grew up when all the girls were called doll, but he realized that that wasn't the case anymore, so it made it a special name just for you!
Clint: maid Marian. if he was Robin Hood, then you just had to be his Maid Marian!
Loki: Usually he called you his love. he isn't terribly familiar with other midgardian names, so my love just seemed to fit well.
Sam: Pretty lady, because you are the prettiest woman he's ever met.
Steve: Stripes. He's stars so it's only naturally for you to be the stripes to his stars!!!
Tony: Sexy. Its Tony, what were you expecting?!?
Thor: usually you were his queen, but sometimes he called you darling.
