The Demon Lords

Do each of them represent a seperate kind of sin? Duke Sallos seems to be inclined towards sexual temptation (If I remember the Lord of the Balors Event correctly).

That also occurred to me. Judging by their peace offers, Sallos is Lust, Meresin is Pride, Judecca is Envy, Statius is Greed, Lethe is Sloth, Ouzza is Gluttony, and Hyborem is Wrath. The last two are the least supported imo, so they may be the opposite (Ouzza demands that you sacrifice population to his glory, which seems like overindulgence to me).