Tintin and friends

 I forgot to mention Brussels' best attraction of all - the Comic Strip Museum (Centre Belge de la Bande Dessinee). At least, if you're an afficionado of Tintin, or of Tibet & Duchateau, Josephine Baker, the Peeping Policeman, or Cubitus, then you'll possibly think so. 

I'm not really aware of them, except perhaps Tintin (vaguely). So I gave it a miss.

I did stumble across Tintin himself though, making his way down a fire escape on the outside of a building. The others all have murals around the city too, and there are lots of comic shops, and a cartoon-themed cafe-restaurant with its own Tintin statue.