If the Nether is an approximation of Hell, then the Aether should be Heaven
So a creature in the Aether should be an Avenging Angel. Very rare. Carries a diamond sword. But instead of hurting you when they hit you, they should send you back to the normal plane.
The "Aether" is not designed to have any hostile mobs. The will-be implemented Sky Dimension will NOT have angels, because Notch says NO to religious references.
The Nether has Ghasts and Zombie Pigmen. No cliche demons/devels, so there is no reason for there to be cliche angels/cherubs in the Aether. Also, an Aether thread already exists.
So a creature in the Aether should be an Avenging Angel. Very rare. Carries a diamond sword. But instead of hurting you when they hit you, they should send you back to the normal plane.
PLEASE ALSO SUPPORT:
Sabata & Grey Acumen's "New Nether"
Grey Acumen's Minecraft 2.0 Suggestion Series