New PC race:

Demibirb
Demibirbs are a race of small, winged humanoids native to the ethereal plane, and which also appear occasionally in the elemental plane of air.  In those realms they are remarkably agile fliers, however their wings lack the strength to allow them to sustain flight on planes with gravity, so in those realms they are restricted to wing-assisted jumps.

Ability score adjustments: Your Dexterity increases by 2, your Wisdom increases by 1, and your Strength decreases by 1

Size: Demibirbs are normally 3-4 feet high with a slight build. They are considered Small creatures.

Speed: You have a walking speed of 25.  Your wings do not allow flight under normal gravity, but when gravity is not present you have a flying speed of 50. 

Languages: You can read and write Common, Auran, and Primordial

Weak wings:  Under gravity, your wings double your normal jump distance. You have a running jump of 20 ft horizontal and 6 ft vertical. You have a standing Jump of 10 ft horizontal and 3 ft vertical.

Desperate Flapping:  You can use your wings to slow your falling speed, and therefore have resistance to damage caused by falling.

Hollow bones: Demibirbs are remarkably light. As a result, you have disadvantage on any saving throws against effects that push, pull, or force movement.

Dogfighting specialist:  You are proficient in Perception and Acrobatics