Ok so if you don't know the show its this frickin awesome and funny cartoon about a slacker type dude who builds his own giant robot that he controls. Now the show has the potential to be something epic if done right and personally id love to see a live-action film, make it with a huge scope and it could be something frickin great, like mind-blowingly, pure unadulterated awesome-ness, which the show was. Oh and it needs scenes that are minutes of rocking the [frick] out to huge battles. Just keep in mind this is a small cast. Main characters only.
Thats Megas^
Tyler Labine is Harold "Coop" Cooplowski
Just in case you don't know of my love for Reaper, well I LOVE Reaper. Ty was frickin great on it, and how can you honestly tell me he isn't perfect for the job. Looks aside, the funny and very slacker attitude of coop's dudeness just IS Tyler. He owns this role.
Jay Baruchel is Jamie
Jay is just plain-old funny. He's proven himself ime and time again, although he does belong to the more awkward class of funny as of late, something more like Knocked Up would make him great for the role. Plus his lankiness combined with the overall look, matches nicely.
Maggie Q is Kiva Andru
Now honestly I can't remember if Kiva was asian or not, though she looks to be drawn as an asian-american, that combined with her name, and her voice artist makes me think so. Maggie is also just an awesome chick, her work on Nikita makes her more than qualified to pull this off, and pull it off nicely.
Woody Harrelson is Goat
I love Woody, especially after he was one in one of my favorite movies ever, Zombieland, but he's a great overall actor, too. He kinda played a similar character in 2012, and would rock goat. Though speaking of Zombieland, i'd imagine that it's director, Ruben Fleischer, would be good to direct this, his comedy is just perfect, and there was a good mix of action in zombieland too. BTW, keep it away from Michael Bay.
Kevin Michael Richardson is Gorrath
Kevin is possibly the most under-rated and talented voice-actor working today. Having voiced from Jabba the Hutt to Tartarus in Halo 2 to even Cleveland Jr. in the Cleveland Show, his epic voice talent is perfect for the ruthless Gorrath.