Minthara is not a white character.
Minthara is a member of a race Larian consistently paints as evil for being dark-skinned people.
Minthara is a member of a race Larian reduces to being nothing but "evil sex elves" out of exoticism and racism, and Minthara's entire characterization revolves around those attributes because being a non-human/elf equates to being non-white in the eyes of Larian's writers and thus defined entirely by Not Being White.
I can't imagine anyone seeing anything in Minthara that is even remotely interesting or likeable, unless one also subscribes to the racist notions that Larian's writers built her entire character, personality, and role in the story around.