Welcome Home Age Regression sfw :) [Requests Open]

1: Info

Info needed:

This AU is known as the "Ex-Human AU". All the one-shots are branching off from it, and some one-shots are part of the same universe.
The only things that are specifically relevant when it comes to this AU have to do with when Wally, Eddie, and/or Frank are stressed over something from the past. They can only go to each other (or Home if he's in control—another part of this AU that will most likely be left unexplained for this book) when they're stressed or caught up in thoughts about the past. No one else (in the neighborhood) knows so far.
Another thing important to this AU is the fact that Wally has a Dissociative Identity Disorder based system. He has many alters. Please let me know if I mischaracterize anything about systems. I'm trying to learn. I've done extensive research on the topic, but, as I don't have a system myself, I'll likely make mistakes.

Everyone has trauma because that's what I do when I'm obsessed with something :D

Wally Darling:
Pronouns: He/him (he doesn't mind though; he'll take any)
Sexuality: Asexual, aromantic (aro/ace) (He is also questioning his sexuality, somewhat. It's not a main focus, he's just trying to figure things out better whilst navigating things when it comes to DID and new things that happen to pop up.)
Gender identity: cisgender male
Age (physical): 23-29 (29 is his exact age, but his body is, in a way of speaking, stuck at 23)
Age (mental): Constantly differing from 2-29
Occupation: Painter
Disorders, mental illnesses, etc: Mid-functioning Autism to high-functioning Autism, Dissociative Identity Disorder (DID), moderate depression, severe insomnia, social anxiety
Height: 3'0/12 apples tall
Best friend(s): Barnaby B. Beagle, Eddie Dear, Frank Frankly, you
s/o(s): None
Wally has DID, and one of his alters is around 4 years old. (That alter's name is also Wally, but everyone just calls him Wallz). Said alter's age is quite iffy, however.
Wally views Eddie and Frank as parental figures, even when he's not age regressing. (In my AU, Wally didn't have loving parents when he was younger. He developed DID due to their constant physical abuse, as well as the abuse from his peers for being socially different.)
Wally likes red apples; he likes both admiring them and eating them.

Eddie Dear:
Pronouns: He/him
Sexuality: Bisexual/biromantic
Gender identity: Cisgender male
Age (physical): 31
Age (mental): 25-30 [1]
Occupation: postman/mailman
Disorders, mental illnesses, etc: high-functioning Autism, ADHD
Height: 4'7
Best friend(s): Wally Darling, Julie Joyful, Samuel Smith
s/o(s): Frank Frankly (married)
-Eddie is very caring.
-Generally forgetful
-Likes crafting and collecting things like stamps
-He is oblivious to how much he talks and how it annoys some of the others, like Howdy.
-He picks up on certain signs that Wally shows with different things. For example, Eddie can tell when Wally is disassociating/dissociating, generally spacing out, or is a different alter than the host.
-He's aware of Wally's past, and his alters.

Frank Frankly:
Pronouns: He/they (they/them in earlier chapters, but shifts to he/him in later chapters unless he's near someone who uses he/him pronouns—it's easier to differentiate the characters this way. The shift in pronouns was due to my realizing that Frank is usually seen with he/him pronouns by Clown.)
Sexuality: Gay
Gender identity: Non-binary
Age (physical): 31, most likely.
Age (mental): 32-35
Occupation: Entomologist (someone who studies bugs)
Disorders, mental illnesses, etc: High-functioning Autism, Obsessive Compulsive Disorder (OCD) (It's luckily not too bad, but it still affects him a lot, just not as much as it is expected to for others), social anxiety
Height: 4'5
Best friend(s): Julie Joyful
s/o(s): Eddie Dear (married)
-Frank can be caring if they need to be.
-He's fine with taking care of Wally, and Littles in general.
-He's aware of Wally's past, and his alters.

Julie Joyful:
Pronouns: Any (mostly she/her, but differentiations may be used)
Sexuality: demiromantic, questioning
Gender identity: Gender-fluid
Age (physical): 29
Age (mental): Constantly differing from 4-29
Occupation: None, but likes organizing fun games for others and playing pretend
Disorder, mental illnesses, etc: ADHD, high-functioning Autism
Height: 3'1
Best friend: Frank Frankly, Wally Darling
s/o(s): None
-She is extremely energetic
-She age regresses sometimes
-She isn't aware of Wally's past, but she is aware of his alters