Hi there,
I might be able to give a little help, afterall those two also have been @my school when I was young

I don't know much about the stories, but I do remember we always had to help Katrijn with calling Jan Klaassen (everybody would scream over their lungs befor he showed up).
Jan is also the person who asks the public to help with all sorts of things such as keeping your eye on something, and we had to warn him when something would happen to it (which ofcourse would ALWAYS happen)
And I'm not sure if I remember this correctly, but Jan Klaassen would always get a beaten with a rolling pin by Katrijn because he lost something.
Jan Klaassen is a good person with a big heart...just a bit dumb
I don't know if this helps a little, their names in english are "Punch & Judy", maybe this will help you in finding a story?
If you like I can translate the wiki from Jan Klaassen & Katrijn, this is a bit of background history