Who is Angus Addams from Stern Men and what is their importance?

Born in 1904 after the murder of his fiery father, Valentine R. Addams, Angus is foul-mannered. The twin brother of friendly and scholarly Simon Addams, Angus hates everyone on the island and states his reasons loudly and crudely. An aggressive, unscrupulous, and intuitive fisherman, Angus earns the nickname Greedy Number One. His closest friend and former protégé, Stan Thomas, whom he also abuses, holds the nickname Greedy Number Two. Angus has a reputation for being a bully and a bigot, but Stan's daughter, protagonist Ruth Thomas, likes him because he is at least not a hypocrite.