okay, found a list of questions about my world and characters.
Which cities are there in your world? - several villages and towns scattered all over the cave world. - the starting village, the village in the Ruins, Grasstown, the village in the Deep Underground, the village in the Farm.
Who lives here? - cat-like creatures called Catlols.
Are there interesting landmarks? - the Mega Fountain, a socializing place, also home to lots of religious festivals
What could spawn conflict in this world? - an evil Doctor taking all the Catlols to turn their cat essence into a cat potion used to let Doctor's cat live longer.
Do people have enough resources? (food, water, wood etc) - yes, everything is good. Food is acquired by killing the bats that roam the cave and baking them. Water is everywhere as underground pools. Wood is made on The Wood Farm next to the starting village.
What technologies exist? (magic? teleportation?) - Teleportation, widespread underground internet and cellular services, cloning
Are people thriving or struggling in this place? - people are thriving, there's happiness everywhere, at least until the Doctor attacks.

In what environment did they grow up? - Catlols were your  cats that fell down into the Mountain and became Catlols thanks to radioactivity in the core.
Do they have particular skills? (Use this for your game mechanics!) - all Catlols can climb the walls.
What is their personality like? How would they react in specific situations? - Catlols are nice and kind catpeople. They are social butterflies, there's no racism and stuff like that. Most of the Catlols are outgoing extravertics. They are like this until they are fed roses. Then they become aggressive, scratching and biting everything in sight.
What do they look like? - Bipedal cats dressed in human clothes

Which nations / rulers are in conflict? - Scattered colonies of Catlols are fighting the Doctor that tries to enslave the Catlols and milk their cat essence for a potion to make Doctor's cat live longer.
What is the history of these nations? - Cats fell into a cave, became Catlols thanks to the radioactivity in the cave and made their own colonies, each village being a separate colony. The history of Catlols is 1000 years long, involving pastiches of historical characters like Cataham Meowcoln or Catwig von Meowven
What is the role of the hero in the grand scheme of things? - Hero tries to rescue the Catlols race from apocalypse by killing the Doctor.