I've seen some TLK RP's where some chars fall off cliffs.. But they arent really hanging, just crouching on the cliff then walking backwards. So I thought of an idea that maybe when a character is on the edge of a cliff they could look like this:
(http://fanart.lionking.org/Artists/Queen_Cheetah/KiaraClingsToTheCliff.jpg)
Again just an idea (I do not own the pic I found it and with any emote)