1. Ryan Reynolds
Perhaps only the animated Dash from The Incredibles possesses a faster and looser superhero-comic approach than Reynolds's flesh-and-bloodstained mutant mercenary in Marvel's Deadpool. The snark-happy Merc With a Mouth quips as quick as the semi-animated Jim Carrey in The Mask, firing off rounds of punch lines like ammo. He nimbly bends to the needs of the script, which relies massively on his fleet comic brio.
2. Andrew Garfield
Even more than Tobey Maguire, Garfield brought limber linguistics and a teen's flippant ease to his amazing Spider-Man. To play the webcrawler's origin (yet again), his ricocheting emotions needed to come across every bit as loose as his rubbery frame.
3. Robert Downey Jr.
It's the gift that never abandoned Downey, even during his own darkest "demon in a bottle" days. Whether playing an '80s cokehead or "the dude playin' the dude disguised as another dude," RDJ works best when his character's mind zooms on overdrive. It's why his Iron Man is the kinetic heart of the big-screen Avengers.
4. Michael Keaton
Keaton's gifts seem to embrace that key trait of Robert Redford's Sundance Kid: "I'm better when I move." Keaton had the jaw and the scowl to pull off wearing Batman's cowl, but director Tim Burton knew he also wanted that post-Beetlejuice looseness to play his dark yet spirited Bruce Wayne.
5. Samuel L. Jackson
Jackson has never been as loose a superhero as when he was the animated Fro-Zone in Pixar's The Incredibles. But it's as Nick Fury in another Disney world, the Avengers cinematic universe, that Jackson has to deftly strike that perfect soldier's balance, booming with vocal solidity while retaining some of his liquid charisma.
6. Christopher Reeve
Has any performer worn the demands of a DC Comics super-suit as perfectly as the Juilliard-trained Reeve? He could radiate steely strength one globe-spinning minute, then deliver twinkling love-story lines with Cary Grant-panache the next. In a role that requires both looseness and solidity, Reeve displayed a high-wire walker's balance.
7. Hugh Jackman
Perhaps no major superhero actor wears such divergent top hats so well: On stage, the Aussie can embody the high-kicking Boy From Oz and do a limber-limbed song-and-dance opposite Neil Patrick Harris. But once he gets Adamantium in his bones as Wolverine, Jackman can tense to a perfect degree, flexing deep acting fibers to become the furry mutant.
8. Christian Bale
The gifted Brit is famously capable of eclectic transformation. Although he may never be able to recapture the child-star looseness of belting out a Newsies tune, he still can reflect a certain actorly ease. Yet prior to Affleck, no Batman was as purposefully stony as Bale's Bruce Wayne. Bale bore deep into the character as if penetrating bedrock. Director Christopher Nolan wanted a beating heart as dark as a Bat-cave; Bale delivered one tortured and stoic soul.
9. Chris Hemsworth
If you wield the hammer Mjolnir, then you're signing up for a sometimes monosyllabic turgidity. Somehow, though, as Marvel's Thor, Hemsworth is able to play a big lug with a teasing ironic twinkle. His performance registers as being as imposing as Norse lore carved from marble, yet he remains suitably playful beneath the armor.
10. Henry Cavill
Trying to play all-powerful can be an actor's Kryptonite. Cavill seems a stiffer actor when donning Superman's rubber suit. But opposite Affleck in the new film, he may comparably seem as loose as Chris Rock voicing Osmosis Jones.
11. Vin Diesel
Speaking of near-monosyllabic, Vin was necessarily rooted in a rigid performance by voicing the imposing CGI tree Groot in Guardians of the Galaxy. Next to him, Dave Bautista's Drax looked as loose as the screws in Harley Quinn's head (as we'll see in Suicide Squad this summer).
12. Ben Affleck
If there's one actor whose performance is looking even more wooden than a talking tree's, it's Affleck's as the new Batman - at least based on footage so far. Affleck has gradually acquired a self-aware stiffness since "graduating" from the highly entertaining indie Chasing Amy to blockbusters, even as he's become a gifted director. That stiffness worked rather ideally in "Hollywoodland," in which he portrayed less-than-naturalistic '50s TV Superman actor George Reeves. Now, in Batman v Superman, we'll get to see whether a rigid delivery is what's best-suited for a new super-role.