Trio with the cat tower skin paired up with Corgi and/or Rabid in the Doggy skin. It looks like the dogs are chasing murderous kitties all over the screen. Cracks me up every time.
Dwarven Archer. I loved her long before her legendary purely because of her celebratory shooting of the flying ostrich at the end of every fight.
Last but not least is Bulwark. The holy belly flops make me laugh out loud. I find myself hoping the other team is extra sturdy so I can watch her fling her face into the ground 3 or 4 times in a row.