What if you have 2600 choices?
So Hal,John,Guy as the main heroes?In 'Empire Strikes Back' terms:
Luke = Hal
Yoda/Vader = Sinestro
Han = John
Leia = Guy
Chewie = Kilowogg
C3PO = Arisia
R2D2 = Ch'p
Lando = Katma Tui
(And just like Empire, I'd have Hal and Sinestro off doing their own thing while John and Guy develop their bromance elsewhere)
plus a bunch of other lanterns in minor roles. The more visually interesting the better, like that one guy who looks like a big 12 sided die with arms, haha.
I'd say Hal and John as the main characters. Hal can be the established veteran, and he can bring John on as his new partner/alternate (similar to Men In Black, only more serious and without a drastic age difference in the two leads). You can also throw Guy in there as the original person the Guardians selected, and show his injury and resulting personality change. Sinestro would be the villain, and Kilowog, Tomar Re, Katma Tui, Carol Ferris and Ganthet would have supporting roles. Kyle can be saved for a sequel.
Great news that both Hal and John are confirmed for GLC.
Any thoughts of Simon Baz or Jessica Cruz DC's been pushing them more lately