Coach William Hanna as Jang-Keng (Tom and Jerry audio, "Small Stuff" only) Production Development According to Register, the target audience of the show is boys and girls from 6 to 11 years old. However, it also has a cult following of teen and adult fans of the real-life Ami Onuki and Yumi Yoshimura who make up the Japanese pop duo Puffy AmiYumi. Register, who was a fan of the band, wished to spread its fame to other parts of the world and thus created the series. The series features the adventures of animated versions of the duo, who have been immensely popular in Japan since making their debut, and is the second television show to be based on the band after Pa-Pa-Pa-Pa-Puffy, which aired in Japan from 1997 to 2002. The group now has its own U.S. albums, including a 2004 companion album to this program, and was known to viewers of Cartoon Network in the US for performing the theme to the Teen Titans animated series. During production of the series, DeLisle learned some Japanese from Kawaye and Young, both of whom speak the language fluently. The cartoon was one of the few cartoons at the time produced entirely in the United States, with a number of characters designed by famed Canadian artist Lynne Naylor, who also designed characters for other Cartoon Network shows, including Samurai Jack, Foster's Home for Imaginary Friends, and The Powerpuff Girls, which got the show nominated for the coveted Annie Award. The pilot used a combination of Macromedia Flash and traditional cel animation. Each program was 30 minutes long (with commercials) and featured three seven-minute segments. The visual style of the show is anime-influenced. The show later switched to Flash animation once the show was picked up for a full series, due to traditional cel animation becoming too expensive to use. The show takes inspiration from various works animated in Japan, such as Pokémon, Digimon, the Sunbow Productions animated series based on Hasbro properties, the Walt Disney Animation Japan animated production, the Marvel Productions animated series, the Studio Ghibli animated production, and the Rankin/Bass animated series. Other inspirations included old MGM and Warner Bros. cartoons, as well as Hanna-Barbera and Mirisch/UA cartoons, UPA shorts, and the works of Jay Ward. Some of the show's crew members included various writers from Nickelodeon's CatDog, including Steven Banks, Kit Boyce and Robert Lamoreaux. Prior to the show's