The game itself allows canon or original characters as long as the original chacaters are based on a fandom. A goddess has plucked your character from their world and placed them in a valley with the sole purpose of raising Creatures that are her life force. Of course there is an evil god trying to kill her and the characters as well.
Depending on if you bring Lincoln in or an OC depends on where I pluck Octavia from. If it's an OC then she will be plucked from before she met Lincoln which means she is still a badass but an untrained badass. Just so she isn't pinning for Lincoln.