The New Yorker reviews the Morgan exhibit, ending with this:
". . . The author wrote in an initialed note to Marcus Stone, the illustrator of 'Our Mutual Friend,' about a certain character’s appearance: 'A weird sharpness not without beauty, is the thing I want.'"
They don't say who the character is, but I remember, from seeing the exhibit. Can you guess who it is? First person to get it right wins two Dickens postcards from the Morgan gift shop.