Every so often as I collect more and more Electoons, I get a notification that I've unlocked a new character at the Snoring Tree. Once I visited there, I found that there are in fact, a variety of characters to choose from, including Rayman, Globox, and some Teensies. It looks like I can also unlock many more based on the number of empty floating bubbles.
Are the different characters simply re-skins of one another? Do any of them have unique qualities that might affect the gameplay?