User blog comment:Undead Chosen One/Diablo/@comment-24916843-20200118124512

Not in the existing canon: strictly saying, angels are postmortem creations of Anu, and demons of Tathameth, so no.

However, an interesting plot twist in D4 would be the "not so different" arc of Imperius and Diablo, which was prepared for in D3, but never implemented (mostly due to second addon being canceled). I would enjoy seeing Diablo and Imperius merging / possessing each other.