After reading 20CB and Pluto, I really had to read Urasawa's most famed work and I'm glad I did. This truly is a near masterpiece of a manga. It felt thrilling throughout the series and almost always had the momentum going. It's themes are really complex and are so well handled. "Are all human lives equal?", "Does every person deserve the right to live?", "Are the hands of a person used for saving lives be used for ending lives?". And I'm glad that the series doesn't give you a black-and-white answer to these questions and leaves them to interpretation.
But it's not just the themes, but it's also the writing that's super impressive. When I first started the series, I had no clue how this story can go on for 18 volumes. I mean, it's all about a man hunting down a serial killer, right? But Monster isn't a story about Johan. It isn't a story about Tenma (well, not mainly at least). It's a story about everyone that's connected to Johan, not Johan itself. I like how you barely get to see the titular character himself. That being said, the cast of characters is insanely huge and more and more of them just got added to the series. However, they all played a role to the story and I love how Urasawa ties them all together. Every character has a story to tell and I'm glad that they all get the spotlight. Monster didn't give me any particular "favorite" character, but the large cast of characters feels more appealing as a whole then them being judged separately. But yeah, Johan was a really good depiction of what a serial killer would be. It's almost frightening to imagine someone like him in the real world.
I would say my only tiny gripe with the series is that it was probably a bit too long. But when I mean that, I mean that it was probably a volume too long. Honestly, that's not much of a complain. Also, a lot of the character designs felt too similar with each other. Like, there's a lot of guys with fat noses and black curly hair in the series, lol.
Anyways, this series is probably a 9.4/10 for me, which is basically the same as my score for 20th Century Boys. But if I have to pick, like if someone pointed a gun at me and I have to pick between the two, I'd choose 20th Century Boys. For those of you who really liked Monster, give 20CB a read! There's actually a lot of similarities between the two, just 20CB is more absurd and lighthearted. Also, Pluto's a great alternative, and it's shorter too.