I am looking for any data on a monster manual or something that I can use for 5e critters/monsters weird stuff.

Is such a book out there?

Thanks!

It is on the way, called Howling Shadows.

or You could look for the 4A Ed Running Wild (the former Eds MM )

he who dances with Monsters
Medicineman

This is also true, converting over shouldn't be too hard.
Also, Aetherology has some wacky astral stuff, such as the poorly photoshoped vampirelike demon apes...
Yeah, just stick with RW or wait for the new one