Yulivia

Yulivia is a femslash ship of General Yunan and Lady Olivia.

Canon
Olivia and Yunan have apparently known each other before the series began.

In True Colors, Olivia stopped Yunan from her very long introduction. They joined Anne, The Planters, and Marcy in their fight against the Toads.

In Olivia & Yunan, the two worked together to save Marcy in an attempt to rebel against King Andrias. While the seemingly succeeded, Marcy was unfortunately recaptured and taken over by The Core. Lady Olivia and General Yunan were captured and then force to wear Mind-controlling collars to serve both Andrias and the Core.

In The Beginning of the End, The two newts were freed after Anne and Sasha broke their collars.

In The Hardest Thing, As everyone says their goodbyes, Yunan and Olivia hold hands, showing their mutual feelings for each other. 10 Years Later, they are shown to be officially a couple, and consider moving into the swamp with the frogs.

Fanon
While the ship was not developed at first, fans soon started to support the couple after the events of Olivia and Yunan. By the series final, the fans were happy that the ship was confirmed.