Echoes, known as Reverb in the original Japanese version, is a Stand from the manga and anime series JoJo's Bizarre Adventure, specifically appearing in Part 4: Diamond is Unbreakable. Echoes is the Stand of Koichi Hirose, a close friend of the protagonist Josuke Higashikata. It has the unique ability to create sound effects that can influence the environment and people around it, evolving through three distinct Acts, each with different powers. Echoes plays a significant role in the series, showcasing Koichi's growth and adaptability in battles against various antagonists.