Clive is a Yazi demon, a race of huge minotaur-like demons. Angel says they are fairly civilized, although this one is upset because Doyle was messing with his girlfriend.
We also meet a kind of possessing demon called a vapor. They come from another dimension and possess people into doing evil for entertainment. They seem to be able to possess people, give them a flaming aura and can summon a plague of insects. They can also sense fear and courage in those around them.
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