The Gorosei, or the Five Elders, are the group of five elite Celestial Dragons who co-ruled the World Government. As such, they served as the overarching main antagonists of the One Piece series.
Each member posses an extremely powerful Mythical Devil Fruit that allows them to transform into gigantic monsters. In addition, they are practically immortal, as they are capable of regenerating even when their body were shattered to pieces.
In reality, they are serving under the secretive supreme ruler of the World Government Nerona imu, who granted them immortality (which Imu can take away at will). They act as the "public" face of Imu's authority.
Only apply this tag if most, if not all members of the Gorosei were present within the image.
