OM(F)G, this thread fills me with dread. I certainly hope that BG3 will not turn out to be fan service for waifu-worshipping incels. The way romances are currently handled in EA is not great, which adds to the fear.
That being said, Minthara could be made into a fine party member for evil MCs. But there already is a cleric that seems compatible with all kinds of good/neutral/evil playthroughs. Maybe joining the Absolute (if that kind of play-through/choice is possible) will alienate almost all party members (except Astarion, maybe?) and Minthara will replace Shadowheart in that case...