Everyone loves characters that are relatable or who have unique quirks or tragic flaws.
I don't like working on stuff unless it's going to make an impact. I want people to talk about this and remember it. If I finally get my crack at Spider-Man and then blow it, ugh. I will happily walk in front of a bus to sell more copies after I finish.
Look at related industries. Concept art for games and film. Animation. Lots of places to hone your skill as an artist and still earn a paycheck while you're waiting to kick the door down. If you're stubborn though, and you absolutely must draw comics because it's your life's dream (and I don't blame you...) you just better make sure you've got something special.
