Maria first showed up back in Rondo of Blood as a child, but this specific design comes from her appearance as an adult in Symphony of the Night. If the Castlevania series continues to progress through time, I figure that will be the sequel series to Nocturne. I don't know too much about Maria otherwise, but this is probably my favorite female design in the series.

Head was from Black Widow. Ponytail was from Loki. Glued it in place, then sculpted the hair and bow around it. Feet were from Emma Frost, with the clasp sculpted on. Hands were from a BossFight Faerie. Sculpted the bows on her lower legs, the skirt section, belt, sleeves, and her full torso and collar. Full repaint, and all done!