Azula is the personification of the colour "Black". This was an idea of an IRL friend which can be found here: http://lycecorp.deviantart.com/ Azula is a slime kind of monster, but as they hate their body. They usual hide it inside of their armor. This armor has a full-face helmet with open-able mouth and cat-like speaker ears which move with their emotions as well as play music according to them as well.