Alright, after reading i have noticed this manga has few references to some manga such as Death Note which is the most notable. I noticed a Kaiji reference where students were playing a card game with the Emperor and Slave, those who have read the skyscraper arc or watched the anime know what it is xD
And from the forums i saw that some people noticed the oddest of references such as facial of Nero and Suzumiya Haruhi, what i want to know is if anyone noticed any other hidden easter egg
Ha, ha... Yeah, there's at least one shout-out per chapter.
The one that sticks out for me is this one When I first read OMK, I saw that page and knew it was a reference, I just didn't know to what. Then a couple years later, I randomly decided to watch Code Geass and went "THAT'S IIIIIT!!!!" when I saw the end credits.