Okay... I think I am pretty good at guessing who is who this game ;P
Got Hawkeye and the Elric Brothers right...
Now for the remaining roles... first... Wrath... being the last mafia... though I don't know if the poison fits him, so it also could be Envy... or something like that... then... Winry - looking at Heph... Maes Hughes the Elric Brothers and poisoned Hawkeye