Toriyama originally created Kuririn along with the Tenka'ichi Budōkai as a method to help add depth to the story, as his editor Kazuhiko Torishima had stated that the series' protagonist, Goku, was too plain.[5] Yūsuke Watanabe, who wrote the screenplay for the film Dragon Ball Z: Battle of Gods, had originally written the film to take place at Kuririn and Android #18's wedding, but Toriyama wrote it to take place at Bulma's birthday party. Watanabe thought Toriyama made the change because he wanted fans to imagine the wedding for themselves.[6] Toriyama cited Kuririn and Bulma's older ages at the end of the manga as a reason he chose for Battle of Gods to take place after the Boo arc since they were in their "strongest condition at that time."[7]