Im gonna have to apologise before i comment here, Ive only read a couple of comics, sorry!
Which is shit because a bloody love the superheroes! I really wish i got into it and really invested my time, and money, in it! But i have read up on alot of the characters and stories on the net. Ive spent multiple hours in single sittings just clicking on link after link after link, to learn about this person, group, then the characters in that group, then their nemesis', and so on and so on! Especially Wikipedia, you click on one page then you need to find out what that was so you click on that, and it can go on for ages! Also i watched alot of the cartoons, and most of the movies, even to this day i still watch the cartoons! Xmen and Spiderman from the 90s were my favourites, and i occasionally watch them on the Kids channels. One recent cartoon that i watched is the Avengers: Earths Mightiest Heroes, i actually had it on series link (which records it everytime its on).
Anyway my favourite characters have been Spiderman, Wolverine, Human Torch, Gambit, and Batman from DC.