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

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

No seconde choice.

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

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

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