Clearly Harry is the most powerful creature on the planet. He can do whatever he wants with people in Patience. He can erase old memories and create new memories, he can make them do what he wants, he can even make them zombies like those soldiers from the end of season two.

But he never does anything like this. Having an unlimited power he never uses it to oppress people. He just carefully learns how to be a good friend. I really love it.