[quote=@Lord Wraith]
Of the vast collection of television shows, movies, and other live-action representations of our favourite comic book characters, who is your definitive, and if not definitive, favourite or preferable representation of that character.

For example, my definitive Lex Luthor is Michael Rosenbaum.

So how about you guys? Who is your Batman/Superman etc?
[/quote]

Since you said live-action and it'd be far too easy to just say "DCAU/Avengers Earths Mightiest/Spectacular Spider-Man" for most characters, I'll stick to that as best that I can.

Batman - Michael Keaton, Bruce Wayne - Christian Bale
Spider-Man - Andrew Garfield, Peter Parker - Tom Holland
Superman - Christopher Reeve, Clark Kent - Dean Cain, with slight leaning towards Henry Cavill
Daredevil/Matt Murdock - Charlie Cox
Captain America/Steve Rogers - Chris Evans
Wonder Woman/Diana Prince - Gal Gadot
Wolverine/Logan - Hugh Jackman
The Flash/Barry Allen - John Wesley Shipp
The Punisher/Frank Castle - Jon Bernthal
Green Lantern/Hal Jordan - Nobody because there's [u]never[/u] been a live action GL, clearly.
Iron Man/Robert Downey Jr. - Robert Downey Jr.
Thor - Chris Hemsworth
Martian Manhunter - David Harewood visually, Phil Morris performance-wise
The Hulk - Mark Ruffalo, Bruce Banner - Edward Norton
Green Arrow/Oliver Queen - Justin Hartley, with Amell's costume and backstory
Alfred Pennyworth - Jeremy Irons
Jim Gordon - Gary Oldman
Lois Lane - Teri Hatcher
Perry White - Lane Smith
Jimmy Olsen - Aaron Ashmore
Ben Parker - Cliff Robertson
May Parker - Marisa Tomei *shrugs* I like the new, not-perpetually-90 years old May
Dick Grayson - Joseph Gordon-Levitt*
Kara Zor-El - Melissa Benoist

[sub]*Even though he was playing an entirely different character for stupid reasons.[/sub]

Sadly, there aren't really any good live action portrayals for some characters I really love, like Barbara Gordon or Wally West. Hoping that changes within the next few years, but I doubt it. It would require Warner Bros. to remove their heads from their asses. I also really had high hopes for Titans' version of Dick Grayson, but that changed the minute that the trailer dropped with a certain two-worded line.

[b]EDIT:[/b] Villains is it's own category by itself, but a few honorable mentions go out to Rosenbaum, Ledger, Hiddleston, Dafoe, Keaton again for The Vulture, and Brolin.