The first eight chapters of "Naruto" were planned before it appeared in "Weekly Shōnen Jump", and these chapters originally devoted many panels of intricate art to illustrating the Konoha village. By the time "Naruto" debuted, the background art was sparse, instead emphasizing the characters. Though Kishimoto had concerns that chakra (the energy source used by the ninjas in "Naruto") made the series too Japanese, he still believed it is an enjoyable read. Kishimoto is a fan of Godzilla, and the tailed beasts mythology was introduced because Kishimoto wanted an excuse to draw monsters. He has said that the central theme in Part I of "Naruto" is how people accept each other, citing Naruto's development across the series as an example.