Um, I just think it would be funny for a small man who is basically afraid of everything. He gets really afraid when he's actually faced with his fears. His friends do occasionally scare him for fun. He is not extremely short like a dwarf, he is somewhere under 1.73 m (5'8") though. If he is reluctant to do something that might involve his fears, Cheng intimidates him into doing them, as he is his boss and a master of martial arts. He is also of course scared of Axel, for obvious reasons. Never really cared for Shrek much.
In Cheng's fighting attire, he well of course simply removes his jacket and pulls his hair down. I would love to draw both him wearing his usual outfit and fighting outfit. Can you imagine his physique?