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Dantetsu Kiryu

Dantetsu Kiryu (桐生 ダンテツ Kiryū Dantetsu^?) is Daigo's father who gave him his amber pendant before his disappearance a decade prior to the series.
Dantetsu Kiryu is portrayed by Shinji Yamashita (山下 真司 Yamashita Shinji^?), who previously portrayed Galactic Swordsman Billion in Chikyu Sentai Fiveman.