Head Cha La

The Head Cha La series is perhaps one of the most well known Dragon Ball doujinshi series. Their books are very funny often involving alternative takes on canon scenes, or just typical slice of life moments with the Z/GT cast in various times and places. The art is very reminiscent of Toriyama, almost astoundingly so. There is a mild theme of Piccolo trying to get into Goku's pants that runs throughout the books, but it's very tame and played up for laughs. It's a gem of a collector's item for any DB doujinshi collector to have in their possession.