Not really sure if these Solar System maps fit in here 100%, but I'll toss this in.
What if Pluto was too big to be considered to be a planet?
Far beyond the orbit of Neptune, there lies a massive plethora of icy bodies and rocks in a region known as the Kuiper belt, but there is one lord that rules the dark depths of the solar system. Only appearing visible for once every six hundred years, the massive body named Pluto was formally discovered in 1930 by Clyde Tombaugh, although it is likely that earlier astronomers have cataloged it when it was visible. Pluto was theorized to be the source of the disturbances that caused the orbital anomalies with Neptune and perhaps Uranus, so it was hunted for many times earlier.
Taking a closer look, it seemed like Pluto was no ordinary object. The world, or star, is a gargantuan hulk, having 20 times the mass of Jupiter, the next largest planet in the solar system. Astronomers in 2005 have declassified Pluto as a planet (stirring up quite a bit of controversy) and instead created a new term which it fits, a ‘Hadal’ (OTL Brown Dwarf). Hadals are somewhat crossed between planets and stars, and they are theorized to have undergone stellar fusion once in their lives. The Hadal has a highly eccentric orbit around the sun, coming 97 AU at Perihelion and going as far as 722 AU at Aphelion. The New Horizons orbiter visited Pluto in the year 2025, when the Hadal was near Perihelion, allowing for quick access. Pluto is magenta in color, and appears to be somewhat of a cross between a planet and a star, as Hadals are. Unlike planets, Pluto generates heat at its surface, reaching temperatures of up to 1700 degrees Celsius. Indeed, it warms up some of the planets in what could be called its own mini solar system. The object is slightly larger than Jupiter, at 152,832 km, although it is much more dense and massive.
The closest body to Pluto is the planet Cerberus, a huge body between the size of Mars and Venus at around 8,340 km in diameter. Cerberus is tidally locked to Pluto, and it even possesses a very thin mars-like atmosphere on one side heated by the world it orbits. The atmosphere is made of Nitrogen, and it’s surface is composed of water ice on the side. As you travel further from the atmosphere, the terrain becomes more rugged and the nitrogen fuses to the ice. There is also a large concentration of Tholins on this side.
Proserpina is the second world in Pluto’s little solar system. It is similar to Titan, albeit a little larger and with much more methane oceans. The object is 5,293 km in diameter, and is covered in a thick layer of nitrogen and methane gas, trapping a decent amount of heat inside which warms the planet up to higher temperatures than the other Plutonian satellites and with a pressure of 23 bars. The world is similar to Titan, except it is 75% covered with seas of liquid nitrogen.
The third and fourth moons from Pluto are Vidus and Larenta, each roughly the size of Earth’s own moon. Vidus is mainly composed of rocky ice and Larenta is half covered in tholins, which are sprinkled throughout the moon, giving it a spotty appearance. Both of these moons are home to fairly large amounts of cryovolcanoes. Between the two smaller worlds and the next major body is the Styx belt, which is similar to the Asteroid belt around the sun, albeit a lot more icer. There are not many big bodies in the Styx belt, and the largest asteroid is only 200 km across.
The fifth major body from Pluto is the largest one, the ice giant Charon. Charon is a little smaller than Neptune and Uranus, at 43,754 km in diameter. The world is a dull indigo, and is home to large concentrations of fusion fuels. Charon is orbited by 23 moons, with three major ones being Hamlet (430 km), Othello (2,376 km) and Macbeth (1,212 km). These moons were of course named after Shakespearean characters, similar to Uranus’s moons.
(Sidenote: As I am a lazy ass, I decided to go reuse some old models of planets I made earlier, which is why if you can’t tell already, Othello and Macbeth are actually OTL Pluto and Charon. Charon just captured them at some point, similar to what happened with Triton for Neptune. I also felt like I had to keep the old Pluto alive, so here he is)
Beyond Charon’s orbit, there lies the Acheron belt, which is Pluto’s rough analog to the Kuiper belt. This sphere extends from 0.5 AU to 5 AU from Pluto, and it is home to many small icy bodies. The largest three of these are Clotho, Lachesis, and Atropos, which are each between 1,000 and 2,000 km across, similar to the main Uranian moons. The Acheron belt is also home to many comets which whizz into Pluto’s inner satellites.
The last major body of Pluto’s mini solar system is the world of Orpheus, at the very edge of Pluto’s hill sphere. Orpheus is actually quite massive, being the size of Venus, and it orbits Pluto at an eccentric 100 year period, which can take it as far as 30 AU away from the Hadal. The world is similar to Europa, and has a very massive subsurface ocean with quite a bit of tidal activity generated from its Mars sized moon/binary companion, Eurydice. But, below the ice, there lies a massive secret.
The Pluto system was first reached by humans in the year 2144, when a joint mission by the Indonesian and Filipino space exploration teams landed on the Charonian moon of Othello, followed by further missions to the Styx belt, the Acheron belt, Larenta, Vidus, Proserpina and Cerberus. Not much really came out of these missions, aside from being a simple mission about exploration and bragging rights. Pluto was not colonised until the 23rd century, which was done by Africans, Selenites, Martians and Neptunians, when the first city of Oko was established on Proserpina.
Things forever changed in the year 2235, when a drill penetrated the dense layer of ice on Orpheus and uncovered something astonishing. There were what seemed to be artificial structures under the ice, and a discovery of a sentient coral like lifeforms with a large hive mind like intelligence. More of these coral lifeforms were discovered under the planet, and communication was established to them by the citizens of New Tycho on the surface. These life forms were named the Orphi, and they seemed to be ancient, having first developed sentience up to 100 million years ago, although they seem to lack any technology whatsoever. The Orphi haven't really moved on from their primitive ways, but a couple hundred minds have settled into sharing a world with the humans and their creations, and some have even migrated to the inner solar system.
Plutonian civilization today is geared towards interstellar colonization, and they are the main port of exit toward the stars. Charon and its moons have the largest shipbuilding industries in the solar system, with massive arkships being towed and fueled in its orbits, while colonial societies enjoy waiting on the casinos and hotel cities of Vidus, which is supplied with Larenta’s massive agricultural industries, all of which is regulated by the supercomputing stock markets and industries of Proserpina. Cerberus is currently in the process of terraforming, which is planned to be done by the crazy idea of plunging it near Pluto to warm up and blasting it with Proserpini nitrogen. Pluto and its satellites are now a bustling metropolis in the void, a civilization in the depths of the hell that is wild space.