The Porcupine and Hyena have almost completely different personalities, which helps the comedy in our animation. I did a quick brainstorm of these to help understand them even more.
From these I did a simple visual research of each animal, to help picture what these personalities may look like in my head on that animal. Alan said imagining our characters as people we know or may have seen in the street will help towards there personality and looks. Gradually building our character without even knowing it, so I keep looking at people now thinking 'Are you our Hyena or Porcupine?'