Vermilion is a high class demon (often mistaken for an imp due to his small height) that has been around for a considerable amount of centuries. 

Vermillion is all about that high society life, all that time spent with humans has made him extremely hedonistic. He is completely full of himself and he loves it. He adores fame and praise and even if he denies it, he's contrantrly craving for attention. 

Although being quite insufferable, for many years he used to be one of the most prestigious demons in the entirety of hell. However, that status is being slowly snatched away by the exponential rise of a newer demon named Beatrice.  

Now, Vermilion has sworn revenge on her, and alongside his "assistants" they all try to overthrow her and go back to his greater days.