Oh, my assumption was Norwegian speakers had as many difficulty understanding Dannish as Swedish speaker do (and are indeed shown to in the comic, since Tuuri apparen't can't understand even a simple greating in Dannish).
But I guess that, yeah, Norwegian and Dannish are closer?
In that case, let's revise this:
Tuuri can understand and be understood by everyone.
Lalli can only understand and be understood by Tuuri.
Emil can understand Sigrun and Tuuri and be understood by by Sigrun, Mikkel and Tuuri.
Sigrun can understand and be understood by Emil, Mikkel and Tuuri.
Mikkel can understand Emil, Sigrun and Tuuri, but only be understood by Sigrun and Tuuri.