There is this artist known as Alejindio, known for future Loud images involving an extra male sibling: Brandon Loud. A commissioner, TheAmazingPeanuts, posted his commissions to Alejindio on DeviantArt. The commissions involve a storyline. An apocalypse occurs for a certain dimension, five future years. Thanos's snap either never occurred in that one or never affected it compared to Alejindio's images involving it. The four youngest Loud sisters escape the dimension to another one and are the only survivors. Basically, Lincoln is the first person they meet, and keeps them a secret, though the young Lola finds them and reports them. The parents are interested and allow them to reside with them.
They also give them different names to avoid confusion with the native siblings of the dimension. The 11-year-old Lola, now with a thing for Lincoln's interests, is now referred to as Lauren. Her sister, Lana, with a history of abuse from bullies, later enacting revenge upon them for it and grudgingly accepting the idea of going by a different name than her current and favorite one, is now Lulu, which she is not a fan of. Also, Lulu was already the name given to Luna by Doug and Michelle during the events of Really Loud Music. Older Lisa is now Libby, which could be TAP and Alejindio's nod to the fact that Lisa's VA, Lara Jill Miller, is also the VA for Libby Stein-Torres of Disney's The Ghost and Molly McGee. And the older Lily is now Lizzy.
I'm thinking of utilizing such characters and designs in place of the corresponding originals, while still keeping the other Louds the same as the series, with everyone aging older as well, just like the series and some fanfics, all this to distinguish my AUs from other ones. Lucy could still be 8-9 and the youngest. You get the idea, though the twins' B-day would need to follow Lincoln's. It's a lot to plan with caution and the proper methods. Also, I might need to speak with TAP and Alejindio about what those four Loud girls' mermaid forms might be like since I'm thinking of giving them roles as characters when I write an extra chapter I still need to write for Humans, Merfolk, and Hybrids.
I could even write two versions of those other fanfics ideas I told you about. One of them being the adoption AU story, which, now that I think about it, could comprise two versions, one with the Louds at their normal ages as the series, and the other with Lana and Lola as old as Lincoln, and Lisa and Lily being older than 8-9-year-old Lucy. And maybe the same could apply to that "Two Louds Left"-inspired idea. IDK. What do you guys think?