At the dawn of time, Primus created Micronus Prime, conscience and moral center of the Thirteen. Although he is the smallest member of this venerated group, he possesses boundless reserves of energy and a clever mind, enabling him to predict the actions of his brothers and sisters before even they know what they're going to do.
Micronus's innocent nature belies his strong ethical sense; although he takes his role very seriously, he approaches his duties with a light Spark and an easy touch. He eschewed the most dour members of the Thirteen in favor of the free-spirited Onyx Prime, whom he once considered his closest friend, and his creative energies also inspired him to strike up friendships with Solus Prime and Nexus Prime. Micronus's siblings always appreciated his presence—he could impart a fraction of his energy upon them using the Chimera Stone, directing his own energies into a form that suited their needs. He would pass a version of this ability on to his descendants, the Mini-Cons.