The Aya universe is a rich and expansive fictional setting that spans across various forms of media, typically used in storytelling, including novels, films, games, and more. In this universe, the term "Aya" often refers to a central concept, character, or place that holds significant thematic or narrative importance. 
Within the Aya universe, there are usually intricate world-building elements such as different planets, civilizations, technologies, and often a complex web of relationships between characters or factions. Themes explored in the Aya universe can vary widely, from futuristic science fiction to fantastical realms or alternate realities, depending on the creators' intentions.