The main protagonist of the fourth part of JoJo's Bizarre Adventure is which of the following?

The answer is Josuke Higashikata because he is introduced as the main protagonist of the fourth part of Jojo's Bizarre Adventure, which is titled "Diamond is Unbreakable." Josuke is a high school student with a unique stand ability, which allows him to heal injuries and control objects. He embarks on a journey alongside his friends to protect his hometown of Morioh from various stand users and unravel the mysteries surrounding the arrow and the origins of stands. Through his determination, bravery, and strong moral compass, Josuke portrays the qualities expected of a protagonist in the Jojo's Bizarre Adventure series.