Oh, that's such a nice compliment that you enjoy some of the world building nonsense I like to ramble about. 🤗 I can literally talk about this stuff all day.
The upside to Solmare's neglect of those nitty-gritty details is that players have more room to explore the other possibilities. I love how everyone in this community has their own headcanons and beliefs to shape their view of the game world and its characters. This community is so creative! I've read so many other ideas that are fascinating and more in-depth than what Solmare have written themselves, and while my ideas won't appeal to everyone, it's nice to have this space to explore them anyway.
When it comes to my personal worldbuilding, sins are really important to fleshing out all the different motivations and goals characters have. I agree that a lot of the characters have the odd moment to shine, but otherwise are lumped into the lazy stereotype of their character. It's really annoying.
Part of the problem with having so many characters and trying to give them screen time is that none of them get developed beyond easily recognizable traits: Beel eating nonstop, Satan being obsessed with cats, Mammon complaining about being broke, Asmo's narcissism and flirtations. Even with the events, some of their choices are missed opportunities to highlight characters in ways we don't normally get to see. Beel being the highlight character for a Fangol or sports-themed event? Nah, throw Barbatos in there because Beel can show up when there's food around. Like yes, okay, we get it. But what else is there? If Solmare won't explore beyond the bare minimum interpretation of their sins, the players just have to do it themselves.
My personal solution for that is two-fold: assigning a secondary sin for each character to add more nuance/depth to their view of the world and their place in it, and expanding the interpretation of their sins beyond the literal meanings. Demon royalty, as leaders of the Devildom and the most powerful embodiments of sin, may have multiple sins that influence their leadership styles and priorities.
(I have some ideas for angelic virtues and elemental alignments, but that's a subject for another post.)
Some other ideas tied to my headcanons about sins include:
- Demons have extremely long life spans and I think it's natural for their secondary sins to shift over time as their environment and circumstances change. (I think in extreme situations, a demon's primary sin may also change - this is something I imagine happened with Diavolo's father.)
- Certain types of demons are naturally drawn to one sin more than others. Crow demons, as a part of Mammon's cohort of demons, tend to be Greed-aligned. Not all Lust demons are incubi, but all incubi/succubi are Lust demons. Lesser demons - the ones that make up the foot soldiers of the Devildom's legions, tend to be aligned with Wrath or Envy which empowers their capabilities in times of war with the angels/other realms.
- Demons that are exorcised and respawn later may have different sin alignments than their previous incarnations.
- Fallen angels demonstrate early "warning signs" of their sin(s) at some point prior to being cast out of the Celestial Realm. Their natures truly manifest once their transformation from angel to demon is complete after falling to the Devildom.
The canon cast and OCs all have designated primary and secondary sins. I know some of the combinations for the OCs in particular might seem a little...odd...but that's because the interpretation of their sin goes beyond "greed = money-hungry" or "gluttony = over-eating". Some of the sins have some overlapping tendencies too. Here are examples of how the OCs' primary sins manifest for them:
Karasu & Greed - Karasu might not appreciate spending or earning money the way Mammon does, but he appreciates wealth of all sorts. Not only money, but knowledge. His nest is a hoard of the riches he's accumulated over his long life, earned through his lifetime's work. Other hints of this sin peek through in his romantic relationships: he wants to be praised, to worship and be worshipped, to have his lover's time and attention and focus solely on him. He gives all of himself in return - an equal exchange, but not one made lightly either.
Azra & Lust - It's not just about sex, but it does play a significant part in how his sin manifests. After a long list of poor choices made with good intentions, he ultimately fell from the Celestial Realm because what he wanted - his relationship with Meta, one that he didn't think was possible if they remained angels under Father's strict thumb - outweighed everything else in his mind. When he fell, he became an incubus, and in a way it damned him to a life where he is forced to feed his sexual appetites with anyone but the one person he desired most.
Tenebris & Gluttony - He was obsessed with finding ways to make himself powerful and worthy in the eyes of the nobility and his father. He embarked on a very selfish and relentless pursuit of knowledge and power that would enhance his naturally gifted magical abilities. Those efforts led to him gorging himself not on food but on humans. Not just their souls either, but their flesh and blood and bones - all harvested without guilt or shame, to be used for his magical experiments and to fuel his spell work. He nearly killed himself in the process but he justified it in his mind as necessary. It was only his indirect involvement in Bathin's exorcism, and the shame and guilt that came after, that finally convinced him to stop and reflect on what he had done.
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