Nate Heywood / Commander Steel

Arrowverse

 * 1)  Amaya / Vixen  - Nate becomes a member of the time-travelling superhero team the Legends, and falls in love with his teammate Vixen. Amaya, however, is from the 1940s, and has a destiny waiting for her after she returns home, including having a family, resulting in the current Vixen, her granddaughter. She ignores this destiny for a time, retiring from the Legends to live with Nate in 2017. After some time, after seeing footage of her granddaughter on TV, realizing that if she does not go back in time soon she will eliminate her from existence, she leaves Nate and returns to the 1940s. Circumstances later lead her back to time-travelling with the Legends, where she and Nate currently enjoy plenty of romantic tension and occasinal sex.