Hi there, as long as the setting remains the same (e.g. within the killing game with the same talents) divergences can be as big or as small as you'd like them to. The only real "divergence" we won't allow is anything that will completely alter the status quo, such as taking them out of the killing game, changing their talents, or altering the fundamental rules of the universe (so, for example, making Kaito or Kokichi a different species or involving magic beyond the level that it already exists in Danganronpa). We can have a more detailed conversation on what "canon divergence" looks like with contributors once they are accepted, but I hope that clarifies things!