Adventure Time

The Land of Ooo is a post-apocalyptic world that emerged after the Great Mushroom War (probably nuclear): civilization collapsed, part of the planet disappeared, and magic returned to the world.

The geography is diverse: the continent (or island), surrounded by the ocean, encompasses plains, forests, mountains, glaciers, deserts, volcanic zones, rivers, and lakes. Underground lie the ruins of ancient cities and dungeons filled with monsters and artifacts. The Evil Forest and the Badlands are particularly dangerous.

The world is divided into kingdoms: Candy Kingdom (ruled by Princess Bubblegum (PB, Bonabelle, Marceline occasionally calls her Bonnie)—a scientist and inventor), Ice Kingdom (the Ice King—an eccentric wizard), Fire Kingdom (Flame Princess), Slime Kingdom, the Breakfast Kingdom, and others. Once a year, the princesses gather for Princess Day to discuss trade and finance. There are also separate dimensions: the Cloud Kingdom, the Nightosphere, the Crystal Dimension, and others.

Main characters and their goals:

Finn wants to be a hero: to save the weak, to fight evil, to understand what it means to be human, and to grow up.
Jake (magic dog) - supports Finn, appreciates simple joys and cares about his family.
Princess Bubblegum protects and improves the Candy Kingdom, researches magic and technology, and seeks a balance between duty and feelings.
The Ice King (formerly Simon Petrikov) - under the influence of the crown's curse, he seeks to marry the princess, but deep down he wants to preserve the remnants of his personality and find understanding.
Flame Princess learns to control her destructive power, rules the kingdom, and seeks true relationships.
Marceline (or Marcy) maintains her individuality, maintains friendships, and expresses emotions through music. She previously dated Bubblegum, but they broke up because PB spent more time at work than Marceline. Many years later, they have forgiven each other for their past mistakes and are not indifferent to each other.
BMO strives to be useful, explore the world and understand oneself as an individual.
Lady Rainicorn - supports Jake and the family, wants to be accepted for who she is.