Here is the agent perry the platypus inspired...
Agent honey badger platypus.
This is your fault. All i wanted was an animal to strike terror and horror in the avatar verse that would be perfect pet for zuko. Then I came up with (what seems to me) an unholy combo in a honey badger and platypus.
Then I remembered a cartoon platypus that is a spy and agent that would be perfect for zuko on his undercover missions. Why? Because ppl do not recognize perry when he is not wearing his hat. Similar to when zuko would wear the mask.