You really don't need to create new pages with '_(demon)' in names. You could just remove redirect from existing page and edit it. Just add '?redirect=no' to page adress, like [this], or follow the link on top of the page redirected to. Then you can edit it normally.
Hell Lust, Hell Gluttony and Hell Greed pages existed since 2012, only those were empty redirect pages leading to Seven Hells page. You could remove '#redirect [link]' from them and type your article there instead.
TBH, I was just copy/pasting and making changes according to the enemy displayed. Since I am not an native English speaker, I don't really understand how to do what you told me here. But since you told me, can you do it? Like somehow get the info from Hell Lust (Demon) to Hell Lust and so forth? I think I would mess it up more if I tried.