Twain as the Earl of Rossmore (from chapter 25 of "The American Claimant"):
Sellers said privately that Rossmore was the most extraordinary character he had ever met—a man just made out of the condensed milk of human kindness, yet with the ability to totally hide the fact from any but the most practised character-reader; a man whose whole being was sweetness, patience and charity, yet with a cunning so profound, an ability so marvelous in the acting of a double part, that many a person of considerable intelligence might live with him for centuries and never suspect the presence in him of these characteristics.
And Mulberry Sellers himself is reminiscent of a character of more recent vintage (just exchange the word "tweet" for "telegraph"):
I would like you to provide a proper outfit and start north as soon as I telegraph you, be it night or be it day. I wish you to take up all the country stretching away from the north pole on all sides for many degrees south, and buy Greenland and Iceland at the best figure you can get now while they are cheap. It is my intention to move one of the tropics up there and transfer the frigid zone to the equator. I will have the entire Arctic Circle in the market as a summer resort next year, and will use the surplusage of the old climate, over and above what can be utilized on the equator, to reduce the temperature of opposition resorts. But I have said enough to give you an idea of the prodigious nature of my scheme and the feasible and enormously profitable character of it. I shall join all you happy people in England as soon as I shall have sold out some of my principal climates and arranged with the Czar about Siberia.

- B. Clay Shannon