I think the ultimate RGB siblings angst AU is one where Nya stayed with the ocean and Lloyd ended up outliving all the others thanks to his oni/dragon heritage. Zane might turn off his memories again, or maybe his life force isn't permanent either, or idk. The point is, Lloyd is left on his own, and centuries of grief later he makes a desperate attempt to reconnect with Nya. Lloyd tries to restore her memories, telling her about Kai and the others, only to realize he doesn't remember them very well either. Their faces have now become a blur in his mind.
Lloyd and Nya bond, starting from scratch, and they slowly remember each other, then they start having distant memories about their lives on the Bounty with the original four and Master Wu.
At this point in time, most of Ninjago forgot their names and only remember them as old and vague legendary figures. After losing his friends, Lloyd finally embraced his oni form as a way to distance himself from the rest of Ninjago. Nya had also become wilder after living for so long as a giant water dragon. They're all alone in the world now, and they only have each other or what's left of them and who they used to be.
Jermaine: Are you tall enough to play basketball though?
Omi: Are you calling me short?
Jermaine: I'm calling you vertically challenged.
Movie Verse RGB Siblings Canon?
Since in the movie Kai, Nya and Lloyd are in the same grade, I assume there are no major age gaps. So they must have a different dynamic compared to the show, but I like to think these three grew up together, and that's why Kai and Nya are so supportive of Lloyd. The way they both call him bro so casually is everything to me. I think they want to help him feel included and show him they aren't that different.
Also, if Ray and Maya are missing in this universe as well, I bet Nya would at least joke about how Koko should adopt them after finding out she's Lady Iron Dragon
"save Cole from the goblin"
Screw that. Let my boy Cole date whoever he wants
Nya: Favorite horror movie?
Kai: It
Jay: Saw
Zane: Annabelle
Cole: High School Musical. After watching it I spent all my middle school years terrified that the entire school would start singing something and I'd be the only one who didn't know the lyrics
Guan: This is such a bad idea.
Chase: Then why are you coming along?
Guan: One of us needs to be able to talk the guards out of arresting us when this inevitably goes wrong.