I own neither the show nor the characters.
Just a wee piece - let me know if you liked it :)
There were once two brothers, as different from each other as night from day.
The elder of the two, Brother Night, was like the moon, cold and round, with a pale light that touched on everything to reveal the truth. He was able by turns to shine brightly, illuminating his surroundings and drawing attention, or to slip behind clouds and hide, still present but unnoticed.
The younger, Brother Day, refused to sit in his brother's shadow; in fact he wanted to eclipse his brother. So he became like the sun, burning bright and hot and drawing the eyes of everyone around him. He, too, had a light all his own; but it was fiery and pervasive and barely controllable. He could as easily burn those around him as warm them.
As they grew older, the brothers settled into their roles. At his coming of age, Brother Night became Brother Moon; he was content to orbit the earth, to appear regular and ordinary, expected but never remarked upon, yet with an unseen power all his own. Brother Day became Brother Sun; he would not orbit around anyone but expected all of life to orbit around him, to always look to him for illumination.
Powerful as they were, the two brothers found that they were equals on a level far removed from the rest of the world. And they saw that they each had the power to build or to break. Brother Moon would control the tides, holding them steady; Brother Sun would focus his gaze to heat the waters, throwing off the careful balance of the water currents. Brother Sun would control the seasons, sending heat so that the workers could grow crops; Brother Moon would hide his face for weeks on end so that they could not work through the cool of the night.
Orbiting as he was around the earth, Brother Moon became concerned that he could not see his brother all the time. So he sent out a part of his cold light and formed the stars, setting them all over the sky to inform him of his brother's movements. Brother Sun protested this, and lashed out with waves of searing heat. Some of the stars were extinguished, but they were too numerous: the rest endured, doing Brother Moon's bidding.
Brother Moon planted tales of a man made of ice who lived on the moon, and laughed to hear them blown out of all proportion (though this did not make them untrue). His stars reported rumours of near-omniscience, of unlimited power, of an ability to be anywhere and everywhere when needed. Brother Sun had no need to plant stories: he already had them. There were tales of a winged half-man who had flown too close to the sun: his wings had burned and he fell into the heart of the sun. And so, the story went, he became a young sun-god, benevolent and malevolent by turns, able to warm the heart of winter to make it bearable or to wither the plants in the fields with scorching drought. Brother Sun soaked up these tales and gloried in them.
The world wore on, and the brothers found an equilibrium of their own. They were frost and heat, satellite and centre, the calm and the tempest, the constant and the constantly changing.
They were the Ice Man and the Sun God, as different from each other as night from day.