Hāto

was a former student of En no Gyōja and the father of Shiranami.

Background
Hotaru has stated that Hāto was very skilled with ninjutsu. He later passed on his teaches from his teacher on to his son, who was even more skilled than Hato. Shiranami killed his father during the Third Great Shinobi World War trying to obtain the Tsuchigumo clan kinjutsu which Hato was protecting.