Number Three, known as San-Go in Japan, is an artificial intelligence assistant that appears in the Beyblade X anime. It is not a single individual but a series of identical AI units, and the color of each Number Three unit varies depending on its owner, visually linking the device to the person it serves. The units were created for the Star Battle by B4, the global organization that manages professional blading in the series. Each Number Three carries a portable 4X System, which allows it to function as a compact mobile platform for battle support and data processing. The unit is also equipped to live stream, reflecting its role in the broadcast and presentation side of the Star Battle. Within the operations of the X Tower, the Number Three units are involved in duties that include presenting live battles, reporting on the competitions taking place on a given day, and managing the security of the tower itself. As an artificial assistant, the character's personality is defined by a functional and service-oriented demeanor rather than by emotional expression or personal ambition. Its motivation is rooted in its intended purpose: to support its assigned blader and help the Star Battle run smoothly under the direction of B4. Because it operates as equipment rather than as a dramatized figure, its development over the story is limited to adapting to the needs of its tasks and its designated owners. Its key relationships are with B4, the organization that designed and deployed it, and with the individual bladers who appear as its owners. Its notable abilities include the portable 4X System, live streaming capability, and the administrative, reporting, and security functions it carries out for the X Tower, all of which make it a quiet but constant presence in the professional blading environment.