Etekichi is a chimpanzee who found and raised Tar-chan as a stepson and friend. At the beginning of the series Tar-chan refers to him as "father," but after it is discovered that he left his wife Eteko, he begins calling him by his actual name. Although he is a chimpanzee he often acts more intelligently than some of the important human characters. He even occasionally speaks, but always as a gag. He enjoys masturbating and having intercourse with all types of female monkeys. In the anime, episode titles were read by Kappei Yamaguchi in Etekichi's voice.

(Source: Wikipedia)