Fullmetal Alchemist: Role Exchange

The entire Fullmetal Alchemist: Brotherhood story, but the roles have been shared around.

I'll try to give you the full list:
Gluttony's played by Ling,
Ling is played by Greed,
Greed is played by Edward,
Edward's played by Envy,
Envy's played by Alphonse,
Alphonse's played by Pride (Selim),
Pride's played by Olivier Armstrong,
Olivier is played by Izumi,
Izumi is played by Wrath (Bradley),
Wrath is played by Riza Hawkeye,
Riza's played by Lust,
Lust is played by Roy Mustang,
Roy's played by Kimblee,
Kimblee's played by Maes Hughes,
Maes is played by Yoki,
Yoki is played by Falman,
Falman is played by Gluttony.
Buccaneer is played by Sig Curtis,
Sig is played by Sloth,
Sloth is played by Alex Armstrong,
Alex is played by Scar,
Scar is played by Shou Tucker.
Elicia Hughes is played by May,
May is played by Nina Tucker.
Tim Marcoh and The Gold-Toothed Doctor swap,
As does Father and Hohenheim.

That's it so far (as for the important roles, anyway), so it needs work.