Because you like WALL-E in WALL-E
Unaware of the fact that he's a toy and made of plastic, Buzz Lightyear is a spaceman on a mission fully of snappy catch phrases. See them in Toy Story.
Carl Fredricksen is a crotchety old man who may just have it in him to take one last, great adventure. See them in Up.
Emmet Brickowski is so upbeat it's not even human. Everything is AWESOME! See them in The Lego Movie.
Flexibility is more than Helen Parr's superpower. It's a key tenet of her personality that allows her to be both firm and understanding. See them in The Incredibles.
A cheerful alien, E.T. just wants to phone home. See them in E.T. the Extra-Terrestrial.
Nemo is a small fish in a vast ocean, but he dreams of seeing it all. See them in Finding Nemo.
Po is a clumsy, friendly panda who likes to take it easy. But now he's expected to save the world? See them in Kung Fu Panda.
Peppy and optimistic, Joy is totally lost when it comes to dealing with Sadness. See them in Inside Out.
As a scaring Assistant, Mike Wazowski frightens children to collect their screams to be used as a power supply for the city. See them in Monsters, Inc..
A determined rookie cop , Judy Hopps has her floppy bunny ears to the ground. See them in Zootopia.
Stuck in space, Ryan Stone will either make it back to Earth and have one hell of a story to tell. Or she will burn into the ether. See them in Gravity.
Puss In Boots is a suave, honorable ladies man/cat who's not above playing cute to get you to let down your guard. See them in Shrek 2.