Hāto

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

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