Hmm, a Light Urge could be fun too honestly. It would be interesting seeing someone compelled to self-sacrifice to the point of potentaily sabotaging themselves and the push and pull of that.

But regarding the Dark Urge itself, I am definitely disappointed that we aren't getting another good-aligned companion, but I will admit that objectively, this dark urge is a really interesting idea. Possibly even a great one. I might just play as it for a later playthrough, it seems like it would be good for playing as a character grappling with that darkness to ultimately rise above it.