It may be a generic suggestion, Could we get more horns and maybe angel like costumes ?
Im interested in something like this https://www.poewiki.net/wiki/Helmet_attachment
Like the delirium horns, or Devil horns or Twisted horns. 

I know that we have the Cavaro and Fall Garzar costumes that are close to what im asking. But Im a bit disappointed in the headbands and hats we have overall in the shop.

We already have an angel costume, but a demon counterpart for that would make sense.

More options like this would be nice but it seems like they're focusing on more lore-friendly stuff for now.

In the meantime though, definitely check out the Halloween outfits. Ram Horn Witch and Vespena are two demonic themed outfits that I love.

Pics in order mentioned:

Always keep an eye out for the rotating costumes to see if any of those work for the aesthetic you want, and also have a look at Sorceress' outfits as they have a darker, demonic theme too.