Best friends or Enemies? (Serenity's backstory)

Growing up, these two had a very diverse relationship. Some days, there were like siblings and inseparable, than other days they would just annoy each other. Well, serenity did that. Herobrine was the only person who understood her, and actually believed her. People never believed serenity. They knew she was telling the truth, but because her mental disorders, they made it seem like she was crazy. Especially cause she was young. One day, there will be a battle between the young hybrid, and young prince, to fulfill a prophecy. Will their relationship continue? Or will it tear apart, as it gets closer and closer, to the day the prophecy.
This story contains:
Trigger warnings, sensitive topics, self harm, smut(maybe), suicidal thoughts
Info about them
Princess Serenity Blossom
This story contains her from when she was 4 to 18
Schizophrenic, bipolar depressed, multiple personalities and anger issues
Species: angel demon hybrid
Prince Herobrine
This story contains him from when he was 6 to 20
Anger issues
Species: demon wolf hybrid
Let's go over their species
Demon wolf hybrids are a rare species, but are extremely dangerous, and highly aggressive. Wolves are known to be aggressive, but demons are always and stay aggressive. So that is the main reason as to why they are so dangerous. They have incredible strength, high speed and are very intelligent. The moment you anger them, your dead.
Angel demon hybrids is a very rare species, a mythical creature at exact. Angel demon hybrids are known to have mix personalities, and have a hard time trusting people, unless around enough. They can be very aggressive if angered, so must let out anger at a certain age so it is controllable. But if not, it's uncontrollable. This species is known to be bipolar, schizophrenic and have multiple personalities.
That's all ya need to know about these two. I'll probably add character list in a chapter.
Enjoy!