Some lore I have managed to brainstorm about Ukko's and Naakkatar's home colonies. All of this can still change + I don't know how big part of the story any of this is yet.
-Two cat colonies who live on a small island in the middle of a river.
-They absolutely hate each other and have been in war since. Since forever.
-Or they were until a huge battle took place and killed such a big part of both colonies that they decided that it is time for peace.
-To achieve this they married Naakkatar and Ukko. Crown prince of one colony and kitten of a well liked family from another colony.
-Both colonies hate and fear "unnatural" stuff (aka creatures like She from Jumalanpelko) so good that Naakkatar and Ukko dont start doing anything weird like switching bodi-- oh fuck
-The colonies dont have names yet so lets call them The Kingdom and Swans
-Lead by king/queen. The role is inherited by the ruling cat's bio kitten (usually oldest but can also be the kitten who fits the role best)
-VERY strict pecking order. King/queen has all the power. (Swans make fun of this since usually cat colonies don't have such dictators as leaders)
-Polygamous (you can also just have one mate but it is rare), pretty fine with queer cats (as long as you are still having babies)
-Having kittens is an honour and cats are encouraged to have litters cause WE NEED SOME CATS TO BEAT UP THE SWANS
-Some cats in The Kingdom have blue eyes! These are mostly in the royal bloodline but have spread
-No clear leader. Swans are lead by the most well liked families
-Monogamous. All cats are to get married before they turn one. Some families arrange the marriages, some don't. You don't HAVE TO marry but you will be side-eyed and everyone thinks you will steal their wife/husband and you won't get to make big decisions (The Kingdom makes fun of this since this isnt natural for cats. Swans go "well at least we arent little hoes")
-Marriages are always to have kittens (so they can have more dudes to beat up The Kingdom) so no no for queers
-They have last names! Usually when cats get married they take the last name of what ever family is more popular at the moment.
-Cheating/having mates outside/before marriage is A BIG NO NO, it isnt rare for cats to get killed for that (more often mollies since having kittens can't really be hidden, tom cats can just say "fake news didnt happen")
-Since (even tho it is super forbitten) it isnt rare that cats have kittens with cats from the other colony The Swans also have a few blue eyed cats (and they are side-eyed cause WHERE DID YA GET THOSE EYES HUH) and if you have a blue eyed kitten (even if it was something they inherited from their grandparents ect) you will have to do some explaining.
So yeah wouldnt want to live in either one of these