|Manga||Chapter 38: Greenback Jane Part 1|
|Anime||Episode 16: Greenback Jane|
Theo is Jane's assistant in the cartel.
Theo was Jane's operator during their work for Nuevo Lareda cartel, who hired their group to make a project of a counterfeit dollar. He was shot as a warning for crossing deadline and budget, reasons which Jane couldn't find reasonable.
He was a member of the international counterfeiting group where Jane was a member of, until the Greenback Jane arc, he worked at the German branch of the group.