Artige Werner is the goody two-shoes always trying to do the right thing. Usually he is also the victim of Skrækkelige Olfert's jokes.
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When Qvist started his series about the horrible kid Olfert, he obviously needed a kid who could be the victim. Olfert always doing the wrong things, Werner would need to be the one to always be well behaved, hence the name Artige Werner, meaning Goody-two-shoes Werner.