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He is teasing and flirtatious with his fiance Elaine and exhibits genuine affection for her, his aunts, and for Teddy. As soon as he discovers the dead body in the window seat, his immediate goal is to protect his aunts. He bravely stands up to his brother at the risk of his own safety.
His bravery, however, is tempered by his arrogance, which sometimes blinds him to what is happening around him.
What is Mortimer Brewster?