I love the kakapo. How can you not? It's a chubby, green, and flightless parrot, probably has a funny walk and is horribly endangered. These are some more of my favourite things:
Another endangered animal, another oasis of cute. This one's from Australia, a carnivorous marsupial that can get big enough to chase a Tasmanian Devil away from a kill (130cm 4kg for a male, females a bit smaller).
A flightless New Zealand rare bird. I have a soft spot for flightless birds. It's not small, and there's almost no information about it online barring a few pictures.