Akakage

Akakage aka The Red Shadow was one of Japan's very first superheroes who existed back in the 1500s.

Appearance
Akakage was a man in his mid 20s who wore dark blue ninja garb with gauntlets that housed his shurikens, a red scarf around his neck and red domino mask that covered his face.

History
During a battle against Shocker to stop an operation where they were hijacking a new quantum energy device, the Kamen Riders accidentally opened a tear in spacetime and wound up being transported to feudal Japan via time warp. There, they witnessed the adventures of a masked ninja, a bird samurai, and a heroic demon who used sound as a weapon.