I saw a Homestuck fanart on deviantArt which depicted Beforus Feferi as the Empress called "Her Imperial Radiance". Do you think that would fit with Feferi's sweet personality?

It would fit, and it’s one of the main nicknames I’ve been using for her personally since, although if she shared the “HIC” acronym, given how Beforan Society was, it may be more accurate to call her Her Imperial Coddler.