Love Interests in Black Widow and Bucky Barnes:
Bucky Barnes’ love interests are few and far between in both the MCU and the comic book pages. One of the serious relationships that Bucky built was with Natasha Romanoff.
Winter Soldier’s Prosthetic Arm:
Winter Soldier’s prosthetic arm is a cybernetic implant attached to Bucky Barnes’ body to be used in place of his missing left arm. He was given a vibranium replacement by T’Challa during the Infinity War of 2018.
Nikolai:
During the War, Natasha fell in love with another soldier named Nikolai. Despite their initial happiness, their union did not end well, as Nikolai was killed and their baby did not survive birth.