To ensure that I answer most, if not some, of any preluding questions I have, I'll happily explain everything below.
Location: I read on the wiki that Whis and his race come from a planet somewhere. So, since none of the Gods are the same race, I made all of the gods from different surrounding planets. The Kaioshins are all on the same planet. As Sour stated, the school was built on their planet. Reason? Daishinkan feels that their planet is superior to the others, so he allowed it to happen.
Age: The Angels, Kais and Gods are all what they're supposed to be. Only difference is that they all go by ages. Sour assigning them ages based on how he thinks they act is both a joke and a fact, since in this story, the Angels are able to change their appearances with their staffs, so they can alter their body however they want to fit the age they like best. However, not all of them can access this feature. Daishinkan only assigns this to his 5 eldest children first, as a "test", leaving the other 13 to develop on their own until they've grown accustomed to their staffs enough to be allowed to use it.
Characters: My friend and I have created identities on the 6 universes' Gods and Angels who had been presumably erased by Zen-Oh in a fit of rage. I'm thinking of having the mom of the angels - who also has an identity - kill herself along with the 6 of them. Either that, or having the 6 of them leave the house on their own at some point. Many of the characters' roles will match that of those in End of the F***ing World and I'll even throw in some OCs if I have to.
Hopefully that answers any and all questions you may have. Feel free to leave constructive criticism, questions and comments in the reviews section!
Now, without further adieu, I give you Chapter one.