Indeed, Bradly James would make an ideal Cyrus. He would also be a good candidate for a young Cedric Guardia, come to think of it.
I've already mentioned my casting choices for a live action movie in another thread, but here is a recap with a few changes in the supporting cast. More important than their individual qualities is their ability to act in an ensemble. Incidentally, these would also be good choices if the film were entirely CG animated:
Crono: Zac Effron (Glad I'm not the only one who thinks so.)
Marle: Hayden Panettiere (Honestly, there's no one else who comes even close to looking like a real-life Marle. She would own this role.)
Lucca: Nicki Clyne (The most important member of the cast. She turned a minor role in Battlestar Galactica into a fan-favorite. She would bring a lot of thought and passion to this most iconic of characters.)
Glenn: Sean Bean - voice (Glenn would have to be a CG creation in order for the character not to look ridiculous. He also has to be voiced by someone seasoned. Liam Neeson would also be a good choice.)
Robo: Hugo Weaving - voice (Hugo's second robot after Megatron. Robo will give him a lot more latitude to act.)
Ayla: ??? - voice (Very hard to visualize. Needs to be an experienced voice actor to give Ayla both primitive charm and soulful passion.)
Magus: Zachary Quinto (Portrayal needs to be both dark and subtle. Sylar and Spock combined.)
Gaspar: Max Von Sydow
Belthazar: Ian McKellan
Melchior: Edward James Olmos
Schala: Ellen Page
Dalton: Jim Carrey
Empress Samele Zeal: Sandra Bullock
King Malcolm Guardia (Marle's father): Bruce Boxlightner
King Aldren Guardia (Leene's husband): ??? (Character is going mad. Other than that, the only thing I can visualize is that Aldren is in his early 40s.)
Spekkio: John Rhys Davies - voice (Spekkio speaks with a combination of god-like authority and mischievous glee.)
So far, I like this best. Though with some
moments.
Zac Effron?? I mean. Really? I don't think he's terrible or anything. But I just can't see that. Maybe if it was an entirely animated film. But live action?? The trouble with this is, its hard to visualize anybody live-action as Crono because I picture actors in my head with crazy spiked red hair. Not that they'd have to do that in a movie (though not live action, I like how Advent Children toned down the cartoony features of the FF7 characters into something almost reasonable).
But yeah. Hmmm. I can't really think of anyone off the top of my head, part of the problem being that Crono is mute in the game. I'd cast someone like James Franco for Crono. Gahh. Dissatisfaction.
Instead of Jim Carrey, I'd suggest Christophe Waltz as Dalton. Waltz can be villainous and funny at the same time, without all the over-the-top insanity of Jim Carrey. Though Carrey is capable of good acting, I think Waltz would be better.
The real one that got me was Sandra Bullock though. I have never seen any movie that she's been in that would make me want to cast her in anything. Especially not to portray all the menace of Queen Zeal.
Personally, I'd go with Cate Blanchett as Queen Zeal.
http://www.youtube.com/watch?v=mHOhPvWlSQc&feature=player_detailpage#t=36s