That's the "Mhasmeah Followers", a boss enemy in the pink forest area of the secret dungeon you can enter in Manastyr. It requires the uniforms of Amagal from the barracks to get past the guard. Who at Whisperwind Farm? The monstergirls?
That's the cowgirl Maxine. As the 0/0 next to the "Scene" button indicates for the number of scenes the character has, she and Lady Forbes on the left have no scenes and therefore can't be unlocked in the CG room yet.
