About Versallasrev, they’re two separate demons (Versal and Lasrev, generally referred to by the collective ‘Versallasrev’) but they only occupy one... space in reality, essentially. So sometimes they can split out of each other and wander around on their own, but they share all physical sensations, and they have some difficulty telling themselves apart or sorting the idea of what’s a trait that belongs to which of them. And most of the time they’re just glopped together in one body or two conjoined bodies.
They switch off which one is Versal and which one is Lasrev, and as far as “what’s their deal” goes, they sort of... grew up alone without much connection or socialization or explanations about what is a ‘proper’ thing to do.
They like to form contracts with people by convincing said person that they need Versallasrev in their life to accomplish something, because feeling needed is good and important, but once they’re there, they don’t really know what to do and a lot of the time they end up treating their contract holder really badly, lying to them and isolating them.
At the core of it they want someone to tell them who they are, and they want to feel special and needed, and they’re scared of the hibernation ‘void’ that demons go into when they don’t have a contract. But they do a lot of damage to the people around them.