He's one of the Warner Brothers and the sibling of War-san.
He and his brother got fooled by the Gintama creators, who convinced them that the series was hugely popular and destined to become a wildly successful worldwide film. After wrapping the Shinyaku Benizakura-hen movie, the two brothers bounced—making it pretty clear they weren't interested in doing another Gintama film adaptation.
Content compiled by AnimeList.moe from publicly available sources.
