This universe being unfriendly to interstellar and especially intergalactic travel would seriously hamper a galactic civilization, and thus be less likely for us to notice them.
There might be hundreds of civilizations out there, each having only expanded to a few dozen stars, not caring to go further. Even the makeup of the interstellar medium might be incredibly dangerous, basically necessitating generation ships to cross. Large scale expansion might simply be too hard.
Gonggong is named after a Chinese water god, and it does indeed have it’s own ice. It’s also red, covered in thiolins like Pluto, but even moreso. There’s also likely a thin methane exosphere, leaving methane frost on windows.
Gonggong is very far out, moving between 33 and 101 AU over it’s 554 year orbit. It orbits at a 30° inclination, so telescopes would pick up some interesting shots of the other planets poles.
The 1/30 g gravity is nothing special, plenty to jump around in, but enough to not fly away easily. It’s slightly flattened by it’s rotation, which is a nice 22 hours, much slower than other trans-neptunian bodies. This slow rotation is caused by tidal forces between it and it’s moon Xiangilu.
Xiangilu is named for Gonggong’s minister, a nine headed venomous snake monster. It orbits every 25 days, nearly exactly a month like Earth’s moon, but in an eccentric orbit, changing size throut the month. Gonggong has a polar orientation like Uranus as well, leaving Xiangilu a constant half-moon in the dim sky half the year. Sadly eclipses would be very rare.
The trip out there is rather long, but once there it seems quite unique and cozy.