Going off the archdevils from the Nine Hells, Zariel would probably be Wrath. She's a former angel who became a devil, and she's all about fighting demons in Avernus. Mammon is undeniably Greed. He makes contracts just to increase his coffers, which are very full. For demons, the demon lord Graz'zt would be Lust. He's all about pleasure. Past that, you could make an argument for a lot of entities being one sin or another. Asmodeus as Pride? Possibly. Levistus is stuck in an iceberg, so Sloth?
Going off the archdevils from the Nine Hells, Zariel would probably be Wrath. She's a former angel who became a devil, and she's all about fighting demons in Avernus. Mammon is undeniably Greed. He makes contracts just to increase his coffers, which are very full. For demons, the demon lord Graz'zt would be Lust. He's all about pleasure. Past that, you could make an argument for a lot of entities being one sin or another. Asmodeus as Pride? Possibly. Levistus is stuck in an iceberg, so Sloth?
Even good deities can suffer from Pride, Wrath and Envy. Gluttony … Dionisius; Pride … Aphrodite; Envy … Hades, Lucifer; Wrath … Lucifer; ...
Will you also be trying to manage your spells and cantrips to mimic the theme of the Sins?