Roderick and Madeline Usher:

Roderick: he was a cadaverous man, with large eyes, thin but curvy lips. He had a delicate Hebrew model nose and a finely molded chin, with a ghastly pallor of the skin. He also has silky black hair ans an alternately vivacious voice.

Madeline: She was very sick and was distant, lonely and indifferent; almost like a ghost.

The Ushers and the House:

Both, the house and the Usher twins, were mysterious and kind of creepy. They seemed very dark and emotion less. All of them were slowly decaying and soon will die, well in the case of the house (since it is a material thing) it will be destroyed.