About Yasu
In Shin Mazinger, he is one of the mysterious employees at the Kurogane House, a spa in Atami. He, Cross and Master seem to be Tsubasa's most trusted followers. His speciality is the use of explosives.
Yasu's original appearance was the manga Violence Jack, where he acted as a yakuza goon.
Anime Appearances
Community
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Yasu
Katou, Masayuki voices Juui here
Silver Spoon 2nd Season
Katou, Masayuki voices Kuramochi here
From the New World
Katou, Masayuki voices Danno, Kuninori here
Case Closed
Katou, Masayuki voices Demiurge here
Overlord: The Undead King
Katou, Masayuki voices Takeshi here
Hell Girl
Katou, Masayuki voices Doc here
Sword Art Online Alternative: Gun Gale Online II
Katou, Masayuki voices Tsukasa, Kinoe here
The Honor Student at Magic High School
Katou, Masayuki voices Gundam, Chouhi here
SD Gundam Sangokuden Brave Battle Warriors