So here's my idea for how your bat creatures body's should look like! As you can see there's the 3 kinds, on the left is the light brown, middle is white, and right is dark brown. So this is what I was thinking for each...

Dark brown: Has bat/devil/dragon like wings and a point on its tail, ridges on its back

White: More angelic wings or bird like wings, short fluffy tails

Light brown: No wings yet has a body built for running

Btw I can't draw bats lol, so if you wanna
change something feel free!
And all these creatures belong to 1NightDragon :)