Bucky:
You: Doll❤
Him: Boo Bear ( -WinterBooBear- omg xD)

Steve:
You: Darling
Him: Capsicle😜

Tony:
You: Baby girl😍
Him: Tin Man

Pietro:
You: Slowpoke
Him: Speedy

Natasha:
You: Cutie
Her: Widow

Thor:
You: Lady Y/N
Him: Goldilocks

Loki:
You: My Queen 👑💁
Him: My King 👑

Wanda:
You: Gorgeous
Her: My Weirdk

Bruce:
You: Beautiful
Him: Brucie💕

Clint:
You: Sass Queen
Him: Birdie