Who is roscoe in the tale of despereaux?

In "The Tale of Despereaux" by Kate DiCamillo, Roscoe is a minor character who serves as the jailer of the castle's dungeon. He is depicted as a somewhat bumbling figure who is not particularly competent at his job. His interactions with the main characters, particularly in relation to the dungeon, help to highlight the somber atmosphere of the castle and the consequences of the events surrounding Despereaux and Princess Pea. Ultimately, Roscoe serves to add depth to the story's exploration of courage, redemption, and the complexities of character.