The Universe is sentient. It is not a place. It is a person. It knows everything that goes on inside of it. And needed a protector.
So it created a man, who, unlike the other inhabitants of this universe, could survive almost any condition in this universe. The man also had the uncanny ability to use the magical particles known as “celestial light” to its advantage, creating wings, portals, and weapons. He could even withstand heavy attacks and phase through matter using this power. This man would later be known as “Supernova”.
However, Supernova was not necessarily free to explore this universe on his own. His mind was partially controlled by the universe itself. He was a vessel for the godly forces controlling him, the same ones he must protect. He wasn’t a man, he was
Supernova’s brain being controlled by the universe itself results in his power depending on how determined he is- the Universe’s will controlled him. And although he does get to think for himself, whenever the universe is in great danger, he gets taken over. Unfortunately for Supernova, this means he will never get to be at peace. There will always be something endangering the universe. This cycle must repeat for the next billion years, until the universe’s heat death, where everything dies, including Supernova.