* Tip Tucci: A 11-year-old human girl who is deeply passionate about art and the beauty of the Earth. She's the protagonist and the one who learns the true meaning of Smekday.
* Joop: A small, green Boov alien who is very enthusiastic and optimistic. He accidentally crash-lands on Earth and becomes Tip's unlikely friend and companion.
* Captain Smek: The leader of the Boov, he is a large, purple alien who is obsessed with efficiency and safety. He's trying to find a new home for the Boov after they have been chased away from their own planet.
* Ky: A Boov girl who is much more thoughtful and empathetic than Captain Smek. She rebels against her society's strictness and finds an understanding with Tip.
* The Boov: The main alien race in the movie. They are all different colors and sizes and have a variety of personalities. They are ultimately trying to find a place where they can feel safe and welcome.
There are also many other characters in the movie, including Tip's father, the human resistance, and other Boov like Garry, Kanko, and the Boov Security Guards.
Let me know if you'd like to know more about any specific characters!