The Debut of The Legendary Vigilante- The Star Hero , Ava Nova

The most popular vigilante throughout the world is Ava Nova, and the public named him The Star Hero. He wears a crimson armor and a dark golden mask on his face. He has never revealed his face ever to the public and he is also not a licensed hero under any country's authority. But his great feats in the most major incidents of the world have earned him the title of "The Star Hero, Ava Nova" as he always comes and goes out of nowhere as a bright crimson falling star. His Quirk is still unknown. He once solved the "New York in Total Fire " incident almost all by himself six years ago. During that incident, he just put forth his left leg and freezing air came out of the feet and froze the whole fire and then All Might saved all the people inside and just then , Ava Nova vanished. Next he singlehandedly destroyed the most powerful terrorist group, 'Adman' , in Siberia. He was then seen many time in many other major incidents like saving people from a falling building and saving a crashing plane all by himself etc. Even though he was a unlicensed hero, he was acknowledged by the world public and the governments of each country ,giving him a special key as a medal and as a license exclusively for him just 3 years ago. The special key had special features and would allow for unrestricted access to many places, and it was named "The Nova Key". By the way, Ava Nova has great speed and strength which made everyone wonder what is his quirk actually and was listed alongside All Might's Quirk as one of the seven wonders of the world.

Why did this person didn't licensed himself as a hero, then he would be considered the most powerful hero the world has ever seen?

What is the true identity of Ava Nova and what are his morals?

What exactly is his Quirk ? Ice, Fire , Super Speed , great strength or control?

Why is he so powerful, even more than All Might?

Will he ever reveal himself?