It’s Darkiplier, guys
“Yuggoth… is a strange dark orb at the very rim of our solar system… There are mighty cities on Yuggoth—great tiers of terraced towers built of black stone… The sun shines there no brighter than a star, but the beings need no light. They have other subtler senses, and put no windows in their great houses and temples… The black rivers of pitch that flow under those mysterious cyclopean bridges—things built by some elder race extinct and forgotten before the beings came to Yuggoth from the ultimate voids—ought to be enough to make any man a Dante or Poe if he can keep sane long enough to tell what he has seen…”
—H. P. Lovecraft, “The Whisperer in Darkness”
Lovecraft confirmed that the then newly-discovered Pluto would be Yuggoth in his Cthulhu Mythos. You know, a planet where the darkness-preferring alien colonists (described above) regularly flee in terror from an eldritch monstrosity that occasionally shows up.
Basically, if the Markiplier fandom were a Cosmic Horror story, Pluto would be exactly the right place for it.