From up here, most things seems so small and irrelevant. Refreshing perspective.
At a really young age wings began to grow out of his back. Even though superhumans and Heroes were already fairly common, Red Kite had to endure a lot of bullying - to the point that he even tried to burn off his wings using a corrosive chemical. In the end, they left his back riddled with chemical burns and scars... but did no harm to his wings at all.
The weeks he had to spent in hospital he spent on reevaluating his power. They were still too small to actually fly, but he could control them like a pair of extra arms. Since they were basically indestructible, he experimented with them until his control had the finesse of any natural limb.
He vanished from the hospital and wasn't heard from until he came back as Red Kite. His wings were then big enough to let him actually fly and he seemed to have a whole arsenal of weapons at his disposal that he simply teleports into his hands when he needs them.