The design was chosen after the team adored the primary sketches by EmissarySteel. The theme of 'fox and hound' was one of many suggestions put forward, but it was the one that stayed due to a fondness among the group despite being taken lightly. When asked about the aims of both DEX and DAINA, it was stated that the pair were targeted towards fans and designed to give producers the voices they needed. Lupin said that DEX and DAINA were a pair, but were not twins. DEX was based on the Hound character of the story and has more 'wolf'-like traits. They were intended to be counterparts that complement each other. DEX and DAINA were given the theme, ' The Fox and the Hound', at the suggestion of Lupin.
