Few things: First this guy, a goopy-slimey fox who is the king of all slimes. the background gives the impression that he's kinda short but he's actually a bit taller than Derick. If he's a king, where's his crown you ask. Well, those colourful slimes above him are his crown. Each float above his head and contains a core that alters his appearance and abilities. This appearance is him in a docile state. While he is sentient he is still part monster, and has a primal side that a quick sketch can be seen in scraps. He is a prankster but overall not very harmful unless threatened, but can also be quite forceful and doesn't take being denied well. If one consumes some of his slime whilst under the influence of a core, they will undergo a bit of a change or have a desire. Alone the slime king has very little power save for mind control if ingested but he cannot change forms whilst inside a person. The king has a passive mind control ability if his head is absorbed into a person. Depending on the core, a person will glow in a certain way, but mostly you can tell by their eyes if they've encounter this creature.
The blue core = Inflation
The cream core = Weight gain
The grey core = Vore
The yellow core = Growth
The purple core = Hyper/gender
The red core = Muscle
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I've decided to combine the old world I made up long ago with a futurey world so it's kinda like final fantasy. So Derik is still a shaman and Shoko is Red mage. This slime king is part of that world too, along with some others that may come into existence. I may do a bit of a rendition of what each core does to the slime king but it would probably be all on one image.