He is one of Marvel's greatest men or its most flawed, depending on how you look at it. He battled problems throughout his life, that's even worry Spidey, but still manages to fight on in the end. He doesn't fear the expectations of others and knows imagination is the most important tool in the universe.
@manwhohaseverything: Fantastic Four would like a word ;)
@fallen_crippled: He was actually one of my favourite heroes as a kid :)