Ergo Proxy inside of themselves: the idea that there are two personalities inside a person and noted that René Descartes' phrase ""cogito, ergo sum"" was the inspiration for it. Satō stated that they originally did not want to explicitly express the concepts of Gnosticism in the anime. However, their personal beliefs ended up reflecting the ideas of Gnosticism and realized how well these terms fit and decided to use them. At first they intended to have Vincent as the leading protagonist and Re-l as a supporting character; however, as they fleshed out her character, she became a much stronger character and began
Ergo Proxy to steal the spotlight from Vincent. This gave them the opportunity to split the narrative between the two characters instead of having a single protagonist lead the story. In Japan, "Ergo Proxy" aired on pay-TV satellite broadcasting network WOWOW from 25 February 2006, concluding on August 12, 2006. "Ergo Proxy" was then released by Geneon Entertainment onto nine DVD volumes from May 25, 2006 to January 25, 2007. The series was licensed by Geneon Entertainment USA for Region 1 release, which began on November 21, 2006 and spanned six volumes. The English dub of "Ergo Proxy" premiered on Fuse TV