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Planet with liquid CO2 oceans and mostly CO2 atmosphere
Planet with fluorine gas instead of oxygen gas
Planet that spins so fast that the strength of gravity at the equator is half that of the poles and the whole planet bulges in the middle
Two nearly equal sized planets that orbit a common barycenter almost exactly between them and are surrounded by a bunch of moons orbiting far enough away that they aren't unstable
Sulfur-rich planets
Planet that used to be the core of a gas giant which was evaporated away by being too close to its host star until a gravitational resonance pulled it into a much higher orbit
Planet with the right surface temperatures and atmosphere to have a highly active water cycle but only a tenth of a percent of Earth's water content, resulting in hundreds of high elevation rivers that join together and grow in size but never outflow into oceans, instead ending on salty delta plains where they evaporate completely to be rained out over and over
Ocean planet bigger than Earth that has dozens of massive supervolcanoes like on Mars instead of plate tectonics, the tops of which form small islands in an endless sea
