This is a very late question but I thought I would ask this out of curiousity in what your favorite creature/demon designs are from buffyverse? Now I still haven't seen all of angel, nor have I read the comics, played the games or seen the unaired pilots so maybe there are cool ones in there, but as of now this is my personal list.
Adam
The first evil original form
Turok han
The mayor snake
The one snake hat glory made to find the key
The first werewolf oz
That one demon who was like willows online admirer only to be this horned demon with a cybersuit
The beast
The gorra demon
The one guardian demon who guarded the orbs that gave warren powers
That dragon at the end of angel finale
Those are only ones that come to mind atm