I'm not sure about negatives effects of sawing-off horns and tail. Demons vary based upon their locale, and can be devilish to animalistic. For example, Japanese demons greatly vary, such as from the ogre-like oni to the bird-people tengu. The demon can be very human or very demonic in appearance, or resemble animals or plants, or simply be humans with extraordinary abilities, it's up to you. If you'd like to have a monster-looking cambion, you're free to do that.
I will check my thread very soon.
22-Jan-2016 00:45:45