Awww, hope I see one of these GMs soon.
I remember when the Arcanist GM (Urianger Augurelt) kept appearing, I found them and all they did was a few emotes, buffed everyone and then disappeared.
I got a few screenshots of that one though :P

http://assets-cloud.enjin.com/users/...nal/163289.jpg
http://assets-cloud.enjin.com/users/...nal/163290.jpg
http://assets-cloud.enjin.com/users/...nal/163291.jpg
http://assets-cloud.enjin.com/users/...nal/163293.jpg

These are sort of off topic, but enjoy xD