Beard of Sorrow: Blood goes through a period like this when depressed after believing he's lost the love of his life:
He was degenerating visibly, under the eyes of all. He had entirely lost the almost foppish concern for his appearance, and was grown careless and slovenly in his dress. He allowed a black beard to grow on cheeks that had ever been so carefully shaven; and the long, thick black hair, once so sedulously curled, hung now in a lank, untidy mane about a face that was changing from its vigorous swarthiness to an unhealthy sallow, whilst the blue eyes, that had been so vivid and compelling, were now dull and lackluster.
Badass Bookworm: Peter was a soldier before he was a peaceful doctor, and when circumstances force him to take up arms again he kills his enemies with surgical precision.
I Want My Beloved to Be Happy: Blood believes Arabella to be in love with another man and is willing to let her go. When he realizes that she is not going back to England with this man, it dawns on him that he has hope.
Loveable Rogue: Peter Blood and his crew (with a few notable exceptions).
Nice to the Waiter: Arabella is kind to all of her uncle's slaves, which sets her apart from the vicious Colonel.