blighter

One who blights.

A person, usually male, especially one who behaves in an objectionable or pitiable manner.

A man or child, especially an annoying one.

"[I]f I had known that Pine was such a blighter as to leave me nothing, I'm hanged if I'd have allowed him to be buried in such decent company."

He knew that the old blighter had to be humored in certain small ways.