Peeta Mellark: First choice: Sterling Knight (17 Again)
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People think he's a terrible actor since he was on the ディズニー channel, but before he was ever on the ディズニー channel, he did 17 Again, and he was good! Plus he fits the character description

秒 choice: Chord Overstreet (Glee)
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Katniss Everdeen First choice: Alexandra Daddario (Percy Jackson) link

No 秒 choice.

Gale Hawthorne First choice: Drew Roy
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秒 Choice: Adam Gregory
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Primrose Everdeen First choice: Elle Fanning
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秒 choice: Jackie Evancho
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Haymitch Abernathy: First choice: Robert Downey Jr. link

秒 choice: Bill Murray (if he was still young)
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Effie Trinket : First choice: Kristin Chenoweth
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No 秒 choice.

These are just the main characters! I'm gonna post supporting roles and small roles after I post this one:)