Who is the devil like figure in your universe and what are they like?
Basically the evil god of your universe or multiverse.
In mine the entire omniverse was created by Order and Chaos. These aren’t gods by basically the first two primordial forces. But what came before was known as Nothing. No mind could truly comprehend it, mortal or even primordial. But nothing cannot exist, it’s paradoxical. When Order and Chaos came into existence Nothing changed. True Nothing is like a black ocean with a black sky and it’s something you don’t want to fall in.
It didn’t exactly hate, this is something the existed before the beings the made everything so it’s basically Lovecraftian, but saying hate is the closest things mere minds could understand. Nothing hates the concept of existence and everything it brings, it hated everything around them, it hated the concept of hate, and wants to return to the state it originally was anyway it wants to. So it created several children representing different aspects of Nothing, Null, Void, Apathy, Eraser, desolation (who later betrayed them and renamed themselves Destruction), and several others.
Nothing decided that if he could wait out and grow stronger. Originally Every time something dies it will return to Nothing. No revival, no afterlife, existence just gone, nothing. Just your soul completely gone. But every thing changed when the first mortal died. Mortals possess an ability known as a Mortal Will.
To sum it up as simply as possible It’s basically Anti-Haxs with multiple resistance (and straight up immunity if it’s high enough) to several things including things that tamper with someone soul, will, or mentality. To beat someone with high will, have a strong will too and just be better (So they could b!tch slap reality warpers, but have a hard time with someone with super strength). It’s split into five sections Persist, Learn, Lead, Create, and Express (which was created by mortals themselves).
The first mortal who died possessed a powerful Will to Persist and even after falling into the Pools of Nothing, it still existed and escaped. Becoming Death. With his new goal, preventing souls from being dragged into nothing. Nothing can drag individual souls down, even their children (excluding Destruction) can with effort. But it would be like killing an ant colony one by one. And They do not want to draw attention to them doing so. So the remaining children of Nothing are trying to drag each universe down into Nothing, slowly. Ones that they won’t notice, ones that are incomplete, one that are ruined already, ones like universe 124.567 instead of 124 or 125 (if that makes since). They have an eternity, which isn’t that long for them.