I think I can make out 17 characters (including the two creators in yellow), or at least I know who their artists are. That includes at least 3 American characters. (I’ll add my guesses in comments, below)

This art was used as a poster for the Basel cartoon museum’s exhibit, last decade:

(right click as needed)

(original link)

Original image here:
https://piefed.social/c/eurographicnovels/p/1937271/tintin-tuesday-a-panel-from-the-blue-lotus

More on Exem:
https://www.bedetheque.com/auteur-4983-BD-Exem.html