Why does the new Belgian passport design feature cartoon characters?

The new Belgian passport is featuring cartoon characters as its design theme.

https://www.republicworld.com/world-news/europe/belgium-unveils-new-passport-design-featuring-comic-characters-like-tintin-and-smurfs-articleshow.html

As far as I know, no other country uses motifs from popular culture as passport design teme. Perhaps the point is that Belgium is a divided society, so they were looking for a neutral motifs?