Hmm let's see the cutest thing that Smudge does would be when he's rolling around on the ground first on his side and then he switched to his back.

Winter's cutest thing would be when she flops down on her back and sticks her feet in the air...or when she starts to dance when you scratch that spot on her back that she likes.

And Tama's well, his cutest thing would have to be when he gets the zoomies or when he tilts his head from side to side when you talk to him, or when he starts to prance when he gets excited...actually he's just cute in general.