Any manga that sucks one in:

A manga that..
Can define a genre
Become it's own genre
Other manga strive to become

Essentially any manga that, while reading, gives on that tingly feeling.

Karakuri Circus - Sucked me in. I didn't give it a high score since there were some things I didn't like about it, but I felt like it was one series that contained a good amount of character development. Everyone had a backstory. Everyone found some kind of ending. The length of this series should tell someone that this is what it is.

Unfortunately, it's not finished in translation mode. ^_^ (But I saw the raws and I'm mostly satisfied.)

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Vampire Juujikai. Its a fucking masterpiece that sucks you in and doesn't let you go even after you've finished it.

Ubel Blatt is great too, not as good as Vampire Juujikai but its still great

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Is this me in a nutshell?
Pretty much.