Boyd is the main antagonist in The Trumpet of the Swan despite his small role as the majority of Louie's scenes focus on either Father or Sam Beaver with him. His intention is to marry Louie's love interest Serena, and he hates Louie for being defective.
Because Louie had interrupted Boyd's wedding with Serena and shown her his cloud heart, telling her that she is his and he is hers, an angry Boyd steals Louie's horn and throws it into the lake, demanding he never come back, resulting in a fight. Not being literate, Boyd ends up crashing into a dangerous cliff's wall when Louie, who has learned to read, flies straight upward while they were fighting.
He was voiced by Seth Green.