Poporu is light pink and white in color and has a long tail. His feet are similar to the feet of a bunny and so he can jump pretty high.
Poporu is a loyal pet to Theo and is always helping him when he needs help. He also has a habit of collecting unwanted items. It is shown that he likes Nobita a lot, too.
He is the one that messes up Nobita's room which leads Doraemon to know that his gadget had a glitch and had opened up a door to another dimension so basically Poporu started the story of this movie in the first place.
He also guides Doraemon and friends to The Temple of Darkness (Ledina's Temple) after Kuku is captured.