James Thoday is the brother of Will who helps him hide Deacon's presence. He is very loyal towards his brother and does not turn him in to the police, even though he believes Will to have murdered Deacon. He is the one who mutilated the corpse and buried it secretly in order to cover up the crime. He even offers to take the blame for the murder in Will's place, as he is unmarried and if he is hanged for murder, Mary would still be provided for. However, he is a good man and is shocked by the idea that his brother tied up Deacon before killing him, which leads to a cooling the the previously warm and close relationship between him and his brother.
James Thoday is a sailor working on a merchant ship. He visits his brother when he is on shore leave, and the Thoday's parrot was a gift from him brought from overseas.