Freud
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His flaw was greed. It's not very convenient for the Bard to have this flaw, as there are only two greedy characters by default. However, pride or anger might even deflect suspicion in case of a check. Therefore, if we accept the Mafia role for Arko, then he is very likely a Mafia checker with the flaw of greed.
Любовь и атомное оружие, братья, любовь и атомное оружие.