Are the Cometkids/other characters safe for kinning?
You can kin any of them EXCEPT Ally, Eve, Howie, and Scrap because Ally is my fursona - Eve is my self insert - and Howie is the boyfriend of my fursona (Ally) and Scrap is the boyfriend of my self insert (Eve) and I would feel really weird about people kinning my sona/self insert's boyfriends. Please respect this boundary, they're really personal to me.
Are the Cometkids/other characters safe to have as F/Os?
All the adult Cometkids/nearfamily/other cast besides Ally Howie, and Scrap are OK to have as F/Os, but please do not do this with the minors.
Are the side patients, Chunklings, and former staff in the AU?
Yes, all the former patients and former staff (besides Cuddles obviously) exist in the AU somewhere.
Are the families of Barry and Uni in the AU?
They are in the AU as well.
Why is Uni called "mom"?
In the future, Uni identifies as transfeminine and uses feminine nouns (mom, Miss/Mrs, sister, wife, girl, etc) and any pronouns (but primarily she/her). Uni also does not identify as a gay man or gay but can be described as queer with a masc preference.
Are any of the characters genders/sexualities different?
The only character who changes is Uni, which is explained above.
Do the half-Cometkids (Norma and Blair) not live with the Comets? (based on the fact they're visiting)
They do, they have rooms at both houses. In the intro arc, Carrie was just dropping them off and decided to take it as an opportunity to bring Hemera and Chloe along for a short visit.
Does Cream have ARFID?
Cream doesn't have an ARFID diagnosis explicitly, but I have it myself and I project my experiences with struggling to eat onto her, which is why she has the traits of ARFID.
What do the characters sound like? (for dubbing purposes or other things)
Here is a post I made describing the main character's voices that can be used for dubbing or voice acting reference.