It is famous as a living dictionary in the Robot cosplay/Mecha cosplay world.He is a strong man who lived in the era of Showa, Heisei and Reiwa.
And still active cosplayer. Super robots, mobile suits, transformers. There is too numerous to mention.One participant said, “When I was four, I watched Mr. Koujin's Robot cosplay and I started Robot cosplay!”Another participant said, "Pamphlet of Comiket 26? Ah! I'll ask Mr.Koujin!"

There is no doubt that the male figure as an Autobot will transform at some cosplay venue as the era changes from Reiwa. While making a name for himself as an ｍountaineer (cafe Mountain) in the Chubu area, he is also active in admiral activities and Saniwa sage activities.