Almost forgot these:
21) hunched over, panting and salivating like a rabid dog (Reminds me of Gollum) =^P~
22) Hiding behind another villain and peaking over shoulder
23) exorcist 360 head turn
24) maniacal laughter while revealing super-imposed skeleton (like Lucan in the EQ2 movie)
25) peel off face to reveal flaming skull (complete with high-pitched laughter)
26) fuming mad (literally in the case of fumes surrounding the villain - sort of a dry-ice entrance - or emerging from head)
27) using cape to turn away and vanish [for use with invisibility or phase shift]
28) diabolical gesture with palms facing one another, and various forms of energy passing between them (fire, energy, electricity, dark miasma, glowing green plasma, etc.)
29) scared stiff - eyes widen and toon becomes statue
30) melting - character is scared into liquid puddle (Major Toht in Raiders of the Lost Ark)
31) rears up edges of cape (Dracula-style)
32) eerie clicking sound (like the bug creature in Mimic)
33) deep growl (like T-rex)
34) hissing (like Aliens)
35) cat arch (like the quintessential Halloween cat)
36) hand to lips then to rear - "kiss my [censored]" (perhaps in the upper end of the game rating)
37) fetal - character falls to the ground and quivers in a fetal position
38) putting on sunglasses ... "it's on" (Wesley Snipes ... in just about any of his movies)
39) palms up, widening to open arms - "Is this/that all you got?"
40) momentary, hot, glowing eyes (complete with humming sound) - as if to sear your soul. This would be very eerie looking for a whole group to do this simultaneously.

41) the Gollum happy dance (in TTT, the morning after he supposedly was rid of his alter ego)
Okay ... that's all I got