Merrill - the same chick that gives you approval points when you speak positively about blood magic and read the evil tomes. And disapproves if you destroy them.
My Hawke loved her but man was she daft. Good thing Hawke was able to get through to her.
Also the chick that managed to recognize on sight what kind of demons we were dealing with and give accurate defense strategies, able to tell if Keeran the templar-recruit is possessed by examining his blood rather than Anders "I'll blast him with magic and see if a demon defends itself or not" approach. Also the same chick who rebuilt a brand new eluvian and connected it to the crossroads by studying elven lore and extrapolating as much knowledge from an eluvian shard that she personally cleansed of the blight, and made every single precaution, even the possibility of her own death.
My Hawke loved her and recognized her brilliance, while also acknowledging she was suffering culture shock and had studied a different approach to magic and spirits than the circle teaches, and thus had different beliefs.
She was able to get the taint of the shard, I wonder if she could've gotten rid of the gray warden taint with further experimentation
Maybe. It's worth a thought. In Dragon Age Origins, Merethari uses healing magic to try and cure the taint in the dalish warden, and Merrill in that origin says she knows the same magic.