Well, the title pretty much says it. I have a story planned out and am about to start writing it. My main character is a teenage girl who finds out she is a witch/werewolf hybrid (either I'll make her adopted or her parents hiding it from her). I want to write her as having bipolar disorder. Do you think a supernatural can have a mental illness? I know that e.g. vampires not but I am not sure about werewolves and witches. What do you think?