Iron Man -

Tony’s early flaw was trying to do everything himself. He built suits that only he could wear, which made him a hero but a bottleneck for progress.

Tony Stark started as a man whose success was built on destruction. His journey to becoming a hero required him to own his mistakes and pivot toward a "mission bigger than himself". Iron Man

The first Iron Man suit wasn’t a sleek, red-and-gold masterpiece; it was a clunky, scrap-metal suit built in a cave. Tony’s early flaw was trying to do everything himself