The Blue Spirit mask of Zuko. Avatar was a animated series from 2005-2008 that focused on the last survivor of his race and his quest to take down the evil firelord. Zuko who was the son was banished and sent to find the lone survivor. Over the series Zuko would turn from evil to good as he was slowly exposed to how the rest of the world saw his nation and what they had done. Zuko would sometimes dawn a blue mask when he needed to keep his identity a secret, like freeing the avatar and commiting robbery so he could get some food for him and his uncle. If you have not watched this I highly reccomend you do so.