I mean Minthara is also an ass, and we can romance her. The alignment of the character is irrelevant (see Minthara, mizora and Raphael's incubus)
And sorry I should've clarified. Not romance in a romantic sense. For of a fling sense and adding general content regarding said character. I feel like his death was sudden and uncalled for, and it would be great to see another ending where he doesn't die.