A "rogue asteroid" that is flying through space. It has a mix of strange features and charachteristics, some of which are simply unimaginable.

I looked at the OPM sigma expansion and found that 1 planet was tilted 90 degs. in axis. I saw this in a couple other mods, so I'm assuming you CAN change obliquity but only to either 0 or 90?

That was not done in Kopernicus and there is no way to do that without other mods.

Unless you change the texture of the planet directly, which is a lot of work and still would not be "realistic".

that's just the texture that tilted and the planet didn't orbit anymore. Basically it looks good, but it's not functional.

Here's a suggestion that probably is just stupid. (but it's worth a try) it's also a bit specific, with lots of story and... stuff, but that is only an example for the concept, and you can make it totally different, or not bother making a planet like this in the first place (i prefer the last option)

a Hypat-like planet far, far away from its host star (likely captured), that has gone through a runaway greenhouse effect a couple million years ago. that's not the weirdest part, however, as it's is not a gas giant, not an ocean world, nor a rocky planet. that is because it has a gas giant's atmosphere and a rocky surface, like Iain, but because of the aforementioned runaway greenhouse effect a very thin layer of the "surface" has melted to form an almost worldwide ocean of ammonia a few metres deep. only a few islands peek above the water, however not permanently, as they are flat enough (<1m ASL) that the ammonia waves can sometimes wash over them (every single one), as they're in reality just ice sand banks that get moved around, formed and destroyed very slowly by the currents.

the runaway greenhouse effect could've been made by a collision that evaporated some of the original methane crust, that later trapped in the heat from the collision, evaporating more methane, and so on. eventually the star's faint brightness was enough to keep the temperature stable.

With the sand banks (sometimes) above sea level, let's say they erode so slowly that they're basically static in-game, as that adds a bit of realism with very little to drive the ammonia currents in the first place. and no, just because it has liquid doesn't mean that it'll host life!

Binary ringed planets. Their rings are kept stable by having nearly .07 KAU seperation. Oh, alse thir SMA from their parent star is nearly 70 KAU. One planet is covered in ice flats and ~2-30m tall ice crystals. lakes of liquid nitrogen can be found here. The other is an ice giant.. It has an upper atmosphere composed mainly of neon as well as 2H and He. Imagine something similar to the image, buth with much more seperation.

A small open cluster of large, hot B and O stars. They aren't within the Kermes cluster, and are their own in their own right. They are somewhat hesd together by their own massive gravity as well as a central pulsar. The pulsar was designated by Kessier Kerman as the 113th object, thus the cluster is known as K113. (Pleaidies analogue). However, scientists calculate the cluster itself orbits the all with a orbital eccentricity of .93.

here's another rather stupid suggestion (concept of course), inspired by the missing ocean bug on Rilna:

(sorry for using the bad graphics of US2, I'm too lazy to install SpaceEngine)

This is totally another cliché habitable planet right in the middle of the habitable zone. It's totally covered in an ocean of the purest water, and totally inhabited by very living creatures. it's home of the But'tholes and Ar'sebutts, two very smart species and blah blah blah.

Over to more serious talks, this planet seems to have a glittering ocean full of... water, and seems to have lively continents greener than the truest emerald, as if it were a materialisation of paradise. the sun is always shining, no matter how much EVE you throw at the atmosphere. it also seems to be rich in Oxygen, Hydrogen and Carbon, confirming its habitability.

key word: seems.

In actuality, it's dead as a rock. Or a copper ore, this planet basically made of six elements: Copper, Hydrogen, Oxygen, more Copper, Carbon and even more Copper.

The seas? just very large and flat deserts made out of mostly blue copper compound regolith, not a single drop of water there, which is further demonstrated by the altitude, they all lie around 1900m-2100m above sea level.

The green continents? just exposed bedrock, which, just like the "ocean", get their colours from copper compounds, this time greenish-turquoise variants. some green valleys sink below the 2000m mark, which would be impossible if the blue copper deserts were an ocean.

the copper is quite interventionistic with the molecule-making, prohibiting the formation of compounds more organic than copper carbonate, copper peroxide and copper hydroxide, and giving molecules like water quite a hard time even existing.

It's theorised that the planet started out much closer to [insert star name here], before getting flung out by [insert fat planet name here]'s gravity to the middle of the habitable zone. that would explain the enormous quantities of copper, a heavy metal, instead of a hard rock like Silicon dioxide, which dominates most planets in the habitable zone. but all of this information hasn't reached the kerbal scientific community yet, they still think it's a far-off paradise. maybe plan a mission here to prove the opposite?

here's a suggestion for ingame description:

"when Kerbal astronomers observed [insert second planet name here], they discovered that a Super-Kerbin-sized object was disturbing its orbit. they immediately pointed the telescopes and found a quite dense blue-green object orbiting [insert star name here] right in the middle of it's habitable zone. adding to the hype, every element needed to sustain life was discovered in it's atmosphere, plus a whole lot of copper. the creatures on this planet probably have copper-based blood cells in their bodies, making this a prime target for ambitious veterinarians in charge of blood transplantation for frogs."

I'll end this rather long suggestion with a star wars meme quote:

IT'S A TRAP!!

A large system with not one, not 2, but 3 habitable planets as well as another habitable moon to boot. You can do whatever you want with the planets and moons, but I have a few suggestions.

-The system is slightly larger than kerbol, thus giving it a slightly thicker HZ

-one of the planets is a shallow ocean world

-one planet has a large, ancient impact crater filled with water

- a turqouise gas dwarf

I also strongly suggest that later on, on minor updates you slowly and gradually make the landscapes more detailed and realistic, sometimes on a few bodies so the change won't be too sudden and you guys won't be overloaded. I also have another suggestion for kerbin: roads. They're just basically strips of textures like concrete or dirt not actual structures, and their only purpose (I guess) is to make the KSC feel a bit less lonely.