Final answer:
Sheriff Tate is the character who appears in court at the end of Atticus's closing speech in 'To Kill a Mockingbird'.
Step-by-step explanation:
At the end of Atticus's closing speech in To Kill a Mockingbird by Harper Lee, the character that appears in court is Sheriff Tate. It is important to note that the excerpts provided suggest a mixture of different texts and do not relate to the scene in question. Therefore, based on the novel To Kill a Mockingbird, it is Sheriff Tate who arrives to bring news that Bob Ewell has been found dead under the tree where the attack on Jem and Scout took place. This moment signifies a turning point in the narrative and showcases the themes of justice and morality that run throughout the book.