Shrek films (Idea Wiki German dub)

Shrek (2001)

 * Elisabeth von Koch as Princess Fiona
 * Norbert Gastell as Shrek, and Wolf
 * Horst Raspe as Donkey, Pinocchio, Gingy, and Thelonius
 * Fredrich Baschulte as Lord Farquaad
 * Frank Welker as Dragon

Horst Raspe's only dubbed film as Donkey, Gingy, and Pinocchio.

Shrek 2 (2004)

 * Norbert Gastell as Shrek, Mongo, and Gingy
 * Christian Bruckner as Prince Charming, Wolf, and Pinocchio
 * Thomas Fritsch as King Harold and Donkey
 * Santiago Ziesmer as Puss in Boots and Muffin Man
 * Anke Engelke as Queen Lillian and Fairy Godmother
 * Elisabeth von Koch as Princess Fiona
 * Frank Welker as Dragon

New cast are added: Anke Engelke, Christian Brucker etc.

Shrek the Third (2007)

 * Norbert Gastell as Shrek
 * Santiago Ziesmer as Puss in Boots
 * Thomas Fritsch as Donkey and King Harold
 * Peer Augustinski as Merlin (although this isn't a Robin Williams role)
 * Christian Bruckner as Prince Charming
 * David Turba as Arthur Pendragon
 * Anke Engelke as Queen Lillian
 * Elisabeth von Koch as Princess Fiona
 * Frank Welker as Dragon

Peer Augustinski (1940-2014) voices Merlin even though he's not played by Robin Williams but instead Eric Idle in English.

Shrek Forever After

 * Anke Engelke as Queen Lillian
 * David Turba as Rumpelstiltskin
 * Thomas Fritsch as Donkey and King Harold
 * Elizabeth von Koch as Princess Fiona
 * Santiago Ziesmer as Puss in Boots
 * Jeremy Steig as the Pied Piper
 * Norbert Gastell as Shrek
 * Frank Welker as Dragon

Last Shrek film to have a German dub from Idea Wiki.