Eiichiro Oda
Toriyama also created a short series, "Neko Majin" (1999–2005), that became a self-parody of "Dragon Ball". In 2006, a crossover between "Kochira Katsushika-ku Kameari Kōen-mae Hashutsujo" (or "Kochikame") and "Dragon Ball" by Toriyama and "Kochikame" author Osamu Akimoto appeared in the manga. That same year, Toriyama teamed up with Eiichiro Oda to create a crossover chapter of "Dragon Ball" and "One Piece" titled "Cross Epoch".