Jessie the Awesome says:
When writing historical fiction, or even historical non-fiction, research is unnecessary. Queen Elizabeth I never married, but in your story, she can have six husbands!
While bad guys are allowed to become good guys, good guys are not allowed to become bad guys unless they're hypnotised or brainwashed. If people became bad guys without being forced, then the bad guys would seem less bad!
Heroes CAN survive on really cold mountains with no protection against the cold better than a cardigan. Duh. Heroes can do anything!
Heroes are, naturally, immune to hypnotism. Your heroine, however, must be particularly prone to hypnotism, to make a nice contrast.
Your heroine must never be more skilled than your hero. She is allowed to be more powerful than your hero, but only if she can't control it/she doesn't know it/it provides an excuse to have the hero be OMGSOKEWL and save her from some bad guy who wants to exploit your powers.
Your hero can never be an average person. He must always come from either a rich family, an abusive family, or an enslaved family.
Robots are incapable of rebelling against humanity, except when they're murderous robots who have no reason to rebel. Remember: most robots love being slaves to humans.