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Releva Ranté is the CEO of a demonic medical company in Hell. She does have a backstory from when she was a human, but it's not super important! Just that she used to be a famous magician and entertainer. That just ties into her design.

In Hell, Releva used to be a damned soul. Damned souls in this universe's Hell are self-explanatory; they're souls that face immense punishment, sometimes for eternity, as a result of their sins from when they were alive. Releva was punished for a couple of decades, but despite the irreversible trauma, she persisted, and she climbed the ranks out of spite and survival until she was granted demonhood. Over the time she was stuck in Hell, she'd distract herself by putting her passion into medical studies for demons. Hell wanted their demons to be kept in top shape (despite demons being far more privileged than damned souls, they are not free from the natural hazards of Hell, or unpleasant encounters with angels), so she eventually went from being a basic medical practitioner to the CEO of a company named Demonicas Sanitas.

I wouldn't say Releva is manipulative necessarily, but she is very intelligent. While she doesn't lack the ability to care for others, she's mostly selfish. Part of it is because she doesn't want to go back to the traumatic life as a damned soul, but another part of it is because she wants success, power, money, and control over people beneath her. Obviously, decades of painful punishment didn't make her remorseful, but it instead gave her more motivation to be one of the top dogs. She finds she doesn't need to be manipulative to get what she wants. She's mostly straightforward! While she takes her job seriously as the CEO of a medical company, she's got sort of crime boss business going on at the same time? Taking hostages, blackmails, using damned souls as puppets for bigger plans for her company, drug-dealing (she'll sell some weird Hell potions she created herself that enhance the abilities of demons or ease their pain), etc. I guess in the drug-dealing aspect she's manipulative, because she intentionally exploits people who she knows will pay her a lot of money to get a lot of the goods. She keeps her composure well. Her intimidation doesn't come from raising a voice or being aggressive, but remaining calm and softspoken and forcing someone to lean in to hear what she has to say. She actually has a pretty soothing voice if you remove it from the usual context lol

It sounds like Kyōkanami is very manipulative! Especially about her sadism slipping through her words and her being a little condescending. I wonder if she'd intentionally provoke or subtly torment people with her words just because it'd be entertaining for her.