Uno. The Eared Unidentified Object

Uno is very cheerful and friendly. And also unusual - no one knows what he is. He can change color whenever he wants, and he can make his arms and legs long, long. It seems that there is so much amazing in him!
And when Uno comes to a new school, he immediately becomes the favorite, as everyone is terribly curious about what he will come up with this time. However, his classmate Leon the chameleon is used to being the most amazing! And he is terribly afraid that now, when everyone wants to play only with Uno, no one will even notice if Leon disappears!
But it seems that for friendship, it doesn't matter at all whether you look like others or not!