Dr. Archibald Monroe
In 1837 Dr. Monroe is just a guy whose chemistry is way more effective than it should be; he's enough of an Oddity that he gets invited around the Club but there's nothing special about him.
Later, he turns himself into a monkey.
The Lady Mirabel, Countess of La Lamina
Did you not read the description?
"Stony" Joseph Smithson
Pugilist made of stone.
A dreamseller, fascinated by humanity.
Quite literally a "Byronic hero":http://en.wikipedia.org/wiki/Byronic_hero personified: "mad, bad and dangerous to know."