im more into the marvel scene, since there is so many characters heroes and human beings that want to change the world in the marvel universe. im a huge fan of the x-men blue and gold team, x- force's "cable" , spider-man, gambit, daredevil, wolverine, sabretooth, ghostrider, johnny blaze, hulk, punisher, deadpool, ironman, warmachine, adam warlock, silver surfer, and so on and so forth.
DC: Green Lantern; (Kyle Rayner, psst he's a Nine Inch Nails fan wink ; shortly followed by Guy Gardner/G'nort, and i have a soft spot for Ch'p whee )
Batman; (Throughout the ages)
Superman; (Has ne-one else read Godfall??)
JLA; (All incarnations, but the 'new' JLA in obsidian age is great)
the list goes on....
Not really a Marvel fan but...
My all tym favourite is the Elseworld Graphic 'Kingdom Come' (which iv finally found and purchased all the original singal parts for xd )
Superman:Godfall.Death of.../Return of...
Batman:Knightfall 1&2 Knightsend.Death in the Family
My two favourites are probably Shakara (From 2000AD) and Punisher (Marvel, yo.)
The first two books of Shakara were incredibly intresting, and I can't wait for the third. Sure, the whole "Mysterious avenger" angle has been done countless times before, but Shakara pulls it off better than ever. None of that "making the guilty answer for their crimes", no noble cause, nothing. He just kils 'em dead. The twist about his nature in Book 2 was totally unexpected as well.
The Punisher I like for similar reasons; there's no pretensious moralizing, no moral high ground. He just what he beleives he has too, and goes through a lot of lead in the process.
I find Deadpool quite an intresting character as well, but unfortunately the comics seem to be quite hard to find.