Vulcan, Derelth, Avia

Vulcan:
--A super-Earth with a thin atmosphere and high gravity, in a tight orbit around its star. It is largely populated by Fluorocarbon-Sulfur life. Because the planet is tidally locked, the subsolar point is so hot that temperatures climb enough to support a large population of Fluorosilicone-flourosilicone life. Liquid water exists antistellar of the terminator, and despite the lack of sunlight, there's plenty of volcanic activity for small populations of protein-water life to survive--except that its moon is a bright enough night light that it projects day-like conditions onto the far side.
--16 Earth Masses. A leftover giant planet core that never pulled itself back up to the frost line and never gathered a thick atmosphere.
--2.267 G of gravity.
--One moon, a small baked rock that provides a lot of illumination for the night side during its orbit.
--0.15au



Derelth:
--A rapidly spinning terrestrial planet. At its poles the gravity is 1.1 G and at the equator it's only 0.06 G. Derelth represents a much tamer version of the other whirligig world in the system, Esjayel.
--1.6 Earth Masses.
--One large blue ocean moon.
--0.98au
--0.4 atm of pressure at poles, 0.0218 atm at the equator. A heavily cratered martian surface exists at the equator, while it is more terrestrial elsewhere.

Avia:
--A terrestrial planet with low gravity and a thick atmosphere. It has warm, generally swampy and oceanic conditions at the surface, with mountains climbing up to cool temperatures and terrestrial pressures. High altitude plateaus contain more terrestrial lands, cool deserts with oases, and a grasslands at a lower altitude. The low gravity and thick (~10x) atmosphere results in almost all land animals being capable of flight. There's even one branch of life that evolved straight from fish to bird. Airship-like floaters dominate the skies.
--0.5 Earth Masses.
--0.7 G
--Three small asteroid moons and a thin, diffuse, dark ring.
--1.2au