 While talking to his long-time friend and fellow manga artist Masakazu Katsura about how there was nothing stronger than a Super Saiyan, Katsura suggested having two characters "fuse" together, leading to the creation of the technique.<ref name="Movies"></ref><ref></ref>

Toriyama enjoyed designing and drawing the distinctive machines of the series.He finds the most fun in designing original mecha, thinking about how a pilot enters and where the engine is.With real world items he would have to look at references, and being off even a little would be noticeable.