Thistle
Thistle Socky is an amazing charecter, who's story isn't quite finished yet.
Abandoned by all her frinds, she locks everyone out. Her lonliness and Thistle's locked up emotions grow cockiness and anger inside of her, at least until she comes to Imagine Accadamy.
At Imagine Accadamy, the school where she is to learn how to use her chanting powers, she meets the best freinds she could ever have- Hero and Lark Song.
Haunted by visions of her eventaully betraying them, Thistle knows she needs to abandon them- or she could do something much worse to them than hurt their feelings.
Showing more courage than any villian or hero before her, she saves the whole world by destroying her own life- and that of Lark's and Hero's (with their permission, of course).
Thistle may be arrogant, awkward, and she may make tons of mistakes, and she may be known as a villain to the rest of the world, but she ends up being a couragous, kind hero, who sacrifices herself for the rest of the world.