Underdark animal companion options

[Astegard]

Would it be possible to add some underdark re-skinned variants of existing animal companions?

For example with existing models:
Bear/boar = small umber hulk
Panther = Displacer beast

I dont know if there are any other models that might be fitting.
Currently the only real fitting UD companions are the spider(that is very weak and iffy with drow arround) and Monstrous humanoid (that forces you into +- slaver rp).
The worg might be mentioned but its seems very exotic to the UD.

edit: nearly forgot hellhound, it seems fitting for drow though its weaker than other companions because it has fire breath(that it may or may not use)