If you are considering taking this up let me tell you one very important thing. It's a spoiler for sure, but it's a fair one because without knowing this you can end up accusing the manga of false advertising:
you will not learn here how a monster is created
As I am sure you know, the story is about a surgeon on a road trip looking for a kid he saved on the operating table, a kid that turns out is pure evil, a monster, something like a murdering psychopath/genius tactician/politician/businessman and also, oh man was this silly, a master of disguise. The surgeon will follow the kid's trail through the years, learning what he's been up to both before and after that fateful surgery.
To me, with a total of 162 chapters, this was about 100 chapters of hate reading. Do not think for a second that any part of me thought this was a good manga just because I read all of it. This was like watching the American TV show Heroes, a show famous for declining in quality season by season until I was honestly relieved it got cancelled.
It's the "I'm sure it'll get better" effect, and Monster truly doesn't. You meet one or two nice characters here and there (right now I only remember one but I am sure there were others) but there is just no payoff.
Apparently with this author, you'll probably like one of his works and feel some form of disdain towards the other, the two works being Monster and 20th Century Boys. I am indeed a 20th Century Boys guy. Full of flaws for sure, and kind of annoying patterns and tons of evidence that he did not plan to write that one for so long, but at least there is payoff, good payoff, and something that ties it all together and leaves you feeling something.
Monster is likely to leave you empty, but then of course people here give it 9s and 10s, so maybe I am just not smart enough to understand the nuances of this masterful piece of work...
