Rename every current regular and then give them silly and fantastic new usernames, obviously.
And then rename/make a staff rank for each European nobility title that exists in English. Rukario's new rank title would be "Holy Roman Emperor", obviously. Or would it be "The Pope"? IDK. Something that fits in the theme that conveys that he's the site founder.
And then I'd rename PC "The Holy Roman Empire".
And then I'd change staff usernames to add "of *insert historic European province/territory name here*" to the end of them.
Like, for instance, my username in this hypothetical would be: "Grand Emperor Alfred Bach of Bavaria" or something to that effect.
There is clearly nothing that can go wrong with this idea. Nothing at all.