Nathan Arceas. He was Father's right hand man when it came to things concerning the Sky District. Whatever question my father had, Nathan would always answer it as thoroughly as he could, and my father would document everything.
They had a very unconventional meeting when father happened to find Nathan passed out in the middle of the woods due to falling asleep while flying. This was right before mother came into the picture. Nathan managed to break my father's cold hard shell and become friends with him.
Nathan was also one of the two angels who granted my father the power to fly into the Sky District so that he could attend Nathan's wedding in the Sky District. Nathan's wife, Marie, was the second angel who sponsored my father.