A (エー, Ē, Viz: Ei, English TV: Ay) was the Second Raikage (二代目雷影, Nidaime Raikage, Literally meaning: Second Lightning Shadow) of Kumogakure. Throughout his reign, he worked hard towards building peace between the other hidden villages.
Before becoming the Second Raikage, he had a long tenure as the First Raikage’s guard. At the First Shinobi World War, during his service, he accompanied him to the first-ever Five Kage Summit. There he stood behind the First watching diligently as the proceedings unfolded.
Eventually, his long service and dedication earned him the appointment of Second Raikage. During his tenure, A entered Kumogakure into a formal alliance with Konohagakure, however, during the ceremony both he, and the Second Hokage were ambushed by the Gold and Silver Brothers, who were attempting to stage a coup d’état. It is unknown what happened to A, but the Hokage was said to have barely escaped with his life. Overall A’s actions helped Kumogakure a lot in the way of achieving peace.