Sailor Cosmos is a mysterious and powerful character from the 'Bishoujo Senshi Sailor Moon' series. She is depicted as the ultimate form of Sailor Moon from the distant future, representing hope and the strength to overcome despair. Sailor Cosmos appears during the later arcs of the series, specifically in the manga, where she plays a crucial role in the battle against Chaos. Her appearance is brief yet impactful, as she embodies the culmination of Sailor Moon's growth and potential, offering guidance and wisdom to the younger Sailor Guardians in their fight for the preservation of the universe.