Krolidad

Krolidad is the het ship between Krolia and Keith's Father from the Voltron: Legendary Defender fandom.

Canon
Krolia was a Blade of Marmora spy sent undercover to scout for the Voltron Lions. While searching near Earth with a loyal Galra scout, a signal was detected. She was forced to turn on the scout. In the ensuing battle, the scout was killed, but Krolia's fighter jet was damaged and crash-landed on Earth in the middle of a desert, right in front of the house of Keith's father.

Keith's father saved Krolia from the wreckage. Presumably after nursing her back to health, he helped her find the Blue Lion months later.

At some point, Krolia and Keith's father became lovers, and Krolia gave birth to Keith. She wanted to name him "Yurak", but his father suggested "Keith" instead.

Some time later, Galra scouts had arrived. Krolia planned to detonate explosives, leaving the task to Keith's father while she went after the scouts. They succeeded, detonating one fighter jet, but leaving Keith's father heavily injured in the process. Expecting the Galra to find the Blue Lion again, Krolia decided that leaving to continue her mission of fighting the Galra from the inside was the only way to keep her family safe. She left Keith's father with her Marmora blade, thinking Keith would some day need it, and soon fled Earth to return to the Blade of Marmora.

Children
Keith Keith is a Galran-Human hybrid. He's the former Red Paladin. He stepped down as a Paladin to work for the Blade of Marmora. For the time being, he's currently the Black Paladin. 

Fandom
AO3

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Trivia

 * Keith's father has no canon name.
 * Fan's have referred to him as "Texas Kogane" given his accent and Keith's last name in the Devil's Due Comics being Kogane, which wasn't present in the original Defender of the Universe series.