Most characters in an animation series
Who
Anpanman
What
1768 total number
Where
Japan (Tokyo)
When

The most characters in an animation series are found in Soreike! Anpanman, written by Takashi Yanase (Japan), which features 1,768 different characters, as of June 2009.

Yanase has been writing Anpanman since 1968. The television series called Soreike! Anpanman has been on the air in Japan since 1988.  It is one of the most popular anime cartoon series for young children in Japan.