My Record of Ragnarok (Fan made)

My fan made Record of Ragnarok roster with a host of different characters while following some parts of the original story. Six years before the original Ragnarok, slightly an AU, but with some different characters, the gods wants to initiate the extinction of mankind but the Valkyrie, Brunnhilde objects and challenges the gods by proposing Ragnarok, where 13 humans fight against 13 gods and whoever wins gets to decide whether humanity continues or not