The friendship of four

At a school named Burgess High, there used to be a crew that was titled as 'The Guardians'.
They were said to be the ones who would help people out and would always be there for you. The creators of the group were Jackson Overland Frost, Rapunzel Corona, Hiccup Haddock III, and Merida Dunbroch. Four kids, each with their own unique personalities. Not only were they a gang but they were the best of friends. All of them different yet they accepted each other.
Due to the proof of the group's message, a lot of people had joined, Mary Katherine, Flynt Lockwood, Elsa Arendelle, Anna Arendelle....... Plenty. It was a miracle.
But after a few years, it suddenly vanished.