TLDR: Flat characters are simple, one-dimensional figures in literature who lack depth and do not undergo significant development. They often support the plot or main characters, provide comic relief, and exemplify themes. Examples include Mr. Collins in “Pride and Prejudice” and Bruce the Shark in “Finding Nemo.” While less dynamic than round characters, flat characters are crucial for storytelling balance and narrative flow.
https://www.literatureandlatte.com/blog/what-is-a-flat-character-in-literature