Where slimes came from is...quite a mystery! They just started appearing one day.they can be found in practically any country. They are usually quite friendly and are easy to get along with. They come in a array of colors, which indicates on what they can do or where they are from.

Orange slimes live near volcanoes, and are immune to intense heat.

Yellow can be found in Desert countries and feel like squishy sandpaper.

Green and brown are normally found in forests and get their color from consuming sticks, leaves and tree bark.

Blue and violet ones live in towns and cites

Blue green ones live in the ocean and look some what like jellyfish, probably cause they like to eat jellyfish

Indigo color indicates they are skilled in the arts of magic.

Sliver are strange, they have sliver fur all over them. These slimes live in arctic climates and are the only slimes that grow hair. Probably due to a diet of small mammals and hobgoblins.

White slimes look like little clouds with eyes. They have the ability to fly. These are usually seen in countries high in the mountains or in the sky.

Pink slimes like in fields of flowers. They can discrete a sweet liquid, that can be sold as perfume.

Black slimes are tough and rubbery. They make excellent body guards. They can bounce around and hit their targets with enough force to dent steel or knock the wind out of an ogre.

Grey slimes are usually thieves or assassins. No one is sure why they turn this color. Some say it’s to make them more stealthy in the shadows.

Metal slimes consume various metals, making them heavy and gives them a appearance like mercury. Some call these knight slimes, as they sometimes serve in army’s or of kings.

-Uncivil slimes-
These slimes are known to be animal like and monsterous.

Red slimes are very dangerous and carnivores. They get their red color from the blood of their victims

Gold slimes are rare, very large, and are dangerous. Rumor has it if a slime consumes a dragon and it’s gold horde they become one of these monstrous slimes.

-Royalty -

There is a King of slimes and surprisingly there is no queen slime. Instead he is married to the goddess of slimes “Jelline”. The other gods have no idea where she came from and think she was a joke created by Zoa, god of monsters. Zoa denies this, but the other gods still think he created her as a joke towards the other gods.
Btw, the King wears a false mustache. He feels it makes him look more noble.

King of the slimes, His Royal Jelly Sire depicted by  Sambaba