TOD
I know the DRs will come up with many I've forgotten, but...
As a young'un:
Uncle Scrooge, Daffy Duck, most any other such character
Casper the Friendly Ghost
Archie
Little Lulu
Blondie (if it was published in comic book form - not sure)
...and many others.
As a teen:
Superman and all related. (Never cared much for Batman then, and not at all for the other action heroes.)
Twilight Zone and certain movie tie-ins, probably Disney stuff for the most part.
Classics Illustrated -- some titles.
As an adult:
Nada. Of course I wish I'd saved all the above. (Don't we all.) But I love looking at the occasional pieces I've come across for low prices over the years. (I don't seek them out or spend serious bucks on them.)
I love the idea of graphic novels and such, but the only contemporary stuff I've been moved to buy have been a few American Splendors, Ghost World, some illustrated Poe... and not too much else that I can think of.