The Fountain is a slugcat. They are blue and fluffy, with a speckled tail that occasionally produces soap.
Gameplay
The Fountain has six food pips, and has a seventh, optional pip. This pip does not carry over to the next cycle; instead, if it is filled, the Fountain gains the ability to produce soap for the next cycle.
Soap acts as a smokescreen that also stuns enemies and slows velocity; it can be used to block projectiles or avoid fall damage if one is lucky. Soap builds up on the surface of water instead of sinking.
The Fountain's diet is the same as Gourmand's. They are also able to maul creatures, similar to Artificer; however, the Fountain gains half a food pip per mauling as long as it does not kill the target, at the cost of it having a cooldown. (With the Rotund World mod, mauling gives more food pips if the target has a large amount of fat. Where do you think soap comes from..?)
Story
The Fountain is a purposed organism made by Lonely Orchestra to, well, be a fountain of soap. Their main goal is to run around, getting rid of dust and dirt and getting soap everywhere, so that the rain can wash it all away and leave the areas cleaner than they were.