First Raikage A

A (エー, Ē, Viz: Ei, English TV: Ay) was the First Raikage (初代雷影, Shodai Raikage, Literally meaning: First or Founding Lightning Shadow) who founded Kumogakure in the Land of Lightning.

Abilities
As the First Raikage and the founder of Kumo, A was undoubtedly a powerful shinobi. Though his abilities remain highly unknown, as the previous "A" the First was most likely capable of performing the Lightning Release: Lariat and its stronger variation.[5]