You're a retard then, if you can't realize.
Monster had 2 interesting characters. Lunge and Grimmer. To a lesser extent Eva simply because she was well written.
Tenma is milquetoast Japanese protagonist, Johan is a horribly boring villain, and none of the other characters are nearly as fleshed out.
That said, I enjoyed Monster and it's definitely better than 99 out of 100 other manga, but it's no 20CB.