I have a bit of a idea to add onto your au if you don't mind, what if dark choco was the successor to DE, because she made it where he was fully corrupted by his curse and then used him against the legendarys, but then he came back and took her place as a consequence. (This was inspired by a quote from his Sovereign of darkness)
Oooo. I don’t mind. That’s a nice idea. I have considered Pome taking DE’s place instead of Dark Choco, but like with SF and Millennial, there can be two. (So maybe Pome and DC)
The only issue with anybody taking DE’s place is that she’s not dead. The reason successors exist is because a legendary wounded up dead/missing. With DE, she’s still alive. And even if she does need a successor, her main goal is to gain power for herself. Dying or handing down a successor role to any of her lackeys is the last thing she wants.
But, I’ll still consider the idea of Successor!Dark Choco. Who knows how the story will go. :3