Figures that embody themes of loyalty and betrayal in mythology often include characters like Achilles and Judas Iscariot. Achilles, known for his fierce loyalty to his comrades in the Trojan War, also illustrates the complexities of honor and personal conflict. In contrast, Judas represents betrayal, highlighting the profound consequences that such actions can have on relationships and society. These themes resonate across cultures, exemplifying the tension between personal loyalty and the overarching moral narrative present in various mythological stories.