Shigen Amawaka (天若 止弦) was the eighth head of Amawaka House and the biological father of Seigen Amawaka.
Shigen resembles his son Seigen Amawaka, with the prominent Amawaka yellow hair streak.
Shigen had a distorted personality. He had no guilty of excuting excorcists as the head of Ritsu, even wanted to kill more innocent people. He was also jealous of Seigen being chosen by Byakko.