Mouse is probably Noggin's greatest friend.
Mouse appears in most pictures with Noggin, sometimes balancing on his shoulder, or hanging on to his clothing as Noggin gets up to his escapades and adventures.
Although Mouse is the most featured character after Noggin, he is never ever mentioned.
He has no name and is just ' there'. It can be fun for readers and viewers to ' spot the mouse' in each picture - sometimes he's not immediately evident.