Echoes is a Stand featured in the manga and anime series 'JoJo's Bizarre Adventure' (JoJo no Kimyou na Bouken), specifically in the 'Diamond is Unbreakable' arc. It belongs to Koichi Hirose, a student who becomes involved with the main characters as they uncover the mysteries in the town of Morioh. Echoes has the unique ability to create sound effects with physical consequences, starting with writing sounds on surfaces. It evolves through different 'Acts,' each granting it new powers and abilities. Echoes plays a crucial role in Koichi's development, symbolizing his growth and adaptability throughout the series.