Ult. Flash and friends
The Flash/Bart Allen: Anton Yelchin
I chose him for all the reasons Andy chose All-Star Spidey. On the plus side, the fact he and Spider-Man look alike could come into play later on down the road...
Barry Allen: Patrick Wilson
Aaron Eckhart was my original choice for Barry, but then Wilson popped into my mind. From what I've seen, he can play the kind and doting father, and then flip the switch and be the stone-faced police officer.
Iris Allen: Julie Benz
I'm a Dexter fan, and Benz's Rita is what I'd want for Iris.
Valerie Perez: Aubrey Plaza
Bart's lady is a fellow science major at Keystone University who's a bit quirky at times. Aubrey Plaza on Parks and Recreation is quirky to say the least.
Ralph Dibny: Jessie Eisenberg
Bart's best friend and fellow geek, Ralpy joins Bart in his love for comics and games, and crime-fighting. Has Eisenberg ever played in a movie where he's not a social outcast? Sure, he seems to be a Michael Cera clone, but he works best in small doses, a supporting character like Ralph.
Jason "Jay Garrick: Mark Harmon
Those that have seen NCIS know that Harmon's Gibbs is a man's man. Plus, he a decent cop. That's what Jay Garrick is, along with being a father figure to Barry and a grandfather figure to Bart.
Officer Denny Colt/The Spirit: Nathan Fillion
Commissioner Dolan's adopted son and one of Bart's few friends, Denny is like the Anti-Bart in a few ways; He was popular in high school, a jock, and a pretty handsome guy who's good with the ladies. Fillion has good comedic timing, which is important when he's trading zingers with Bart as Officer Colt, and as The Spirit.
The Rogues
Captain Cold/Lenny Snart:
Jeffrey Dean Morgan
JDM as Cold might be a bit cliche, but he takes a blue collar approach to his acting and Cold is always a blue collar guy.
Heatwave/Michelle Rory: Jaime Murray
Another Dexter alum, she played Lila in season 2 of the show. A crazy, psycho-***** who liked to start fires. Need I say more?
Mirror Master/Evan McCullough: Paddy Considine
I haven't seen Considine in too much, but I've enjoyed him in every movie I've seen him in. He's be a good choice for the Scottish criminal turned rogue.
Weather Wizard/Mark Mardon: Will Arnett
Weather Wizard is a TV weatherman who has a fall from grace that leads to him becoming the rogue. From the way I have him talking in my head and acting, he's a very short-sighted egotistical character. Sounds like almost every character Arnett has played.
Trickster/Axel Walker: Jason Lee
Trickster is an angry computer nerd with a grudge on the world. Brodie Bruce seems like a natural choice.
The Top/Roscoe Dillon: Jon Hamm
In UDC, Top ditches the goofy outfit for a business suit. As the Octopus' right hand man in Central City, he uses his metahuman power of persuasion to get **** done. Who better to play a silver-tounged baddie than the Mad Man himself?
The Octopus:
The crime lord of Central City would never show his face, but I picture
Powers Boothe as the voice behind the boss. Boothe just has one of those memorable voices.
and, two future villains...
Reverse Flash/Professor Ed Thawne:Davie Hyde Pierce
Yep, Niles is Thawne. Intelligent, arrogant, with a very dark side. Pierce is who I picture as the negative to Bart's positive.
Dr. Alchemy/Professor Roland Desmond: Bryan Cranston
In all the years I watched Malcolm In The Middle, Byran Cranston's goofy father character was one of the best part's of the show. When I first saw Breaking Bad, I was amazed at the transformation. I wasn't sure this was the same guy. And that's how I picture Desmond and his alternate personality Alchemy being. A nice and harmless guy as Desmon, and then turned into this strange and different man known as Alchemy.