Bucky is an Avenger, he's got a metal arm and is an assassin. Bucky has a bad past with hydra, a lot of trauma. Bucky was married and they even went to the war together, her name was Jax. Bucky, Steve and Jax were the trio.

Bucky was on a mission, then seen Jax brainwashed by hydra. They started fighting, Bucky trying to get Jax to remember. But Bucky gets po inner and he shouts

Bucky: Goddamn doll, that one hurt...

Jax remembers the nickname 'doll' Bucky always called her.