I think this image is a reference to Pontiff Sulyvahn from Dark Souls 3 considering the way Remilia is presenting, the background, and the other drawings from the same artist.

Remilialover said:

I think this image is a reference to Pontiff Sulyvahn from Dark Souls 3 considering the way Remilia is presenting, the background, and the other drawings from the same artist.

The background does kinda look like Cainhurst Castle from Bloodborne too