The PaRappa The Rapper franchise started with the release of the rhythm game PaRappa The Rapper on December 6, 1996. With the millenial switch of 1999-2000, second game Um Jammer Lammy came out. A year later, 2001, the PaRappa The Rapper animation stared airing.
Rodney Alan Greenblat, self proclaimed mother of the franchise, designed Parappa together with "father" Masaya Matsuura. Before creating Parappa and even working with the concept of a video game, Rodney already developed Katy Kat, Sunny Funny and PJ Berri and were adopted within the franchise.
On December 6, 2016, the franchise existed for 20 years (1996-2016), and the anime for 15 years (2001-2016).  In celebration of this occassion, PJ Berri no Mogu Mogu Munya Munya came to be, animated shorts surrounding PJ Berri, using the comic lore.