Balloon Men

The Balloon Men! These dumb looking aliens study planets and figure out what poisons kill their inhabitants, and then fill themselves with that very substance, and then rule the world, as any physical attacks will release the poison, and kill a bunch of people.

While I don't have the particulars for you, they are actually a sort of slime mold which spreads over the skin of a creature, eating it slowly from the outside in. That explains their different shapes, as they retain the shape of whatever they originally killed.

Dragon God

This is the Dragon God. He's a pretty nice guy, but people are creeped out by him, 'cause they can see his insides. It really bums him out, so that's why he's okay with living in space. He shoots incredible lasers from his trio of eyes, and once destroyed a whole fleet of alien invaders bent on the conquest of Earth, and Earth didn't even say thanks! What a bunch of jerks! Huh!

Also, he moves around by *ahem* dispelling gases, as there's not a lot of air in space, and, even if his wings had some sort of film between them, they wouldn't do anything when flapping!