beerko
A character by Oota Jun'ya, creator of the Touhou doujin game franchise, which was drawn for the Akihabara Beer Fair (秋葉原ビールフェア), a semiannual beer event running 9-11 days. (E.g., the 3rd Fair ran from Nov. 25-Dec. 5, 2011; the 4th from Apr. 23-30, 2012; the 5th from Nov. 23-Dec. 2, 2012; and the 6th from Apr. 26-May 5, 2013.)