Warning! Spoilers ahead for Blue Exorcist chapter 134!
Blue Exorcist's latest twist follows a major formula in One Piece that many fans view as key to its success. Mangaka Kazue Kato executes her version of the trope so well in the latest chapter of Blue Exorcist that, had it been done in One Piece, fans would consider it one of Eiichiro Oda's crowning achievements.
Aside from the excessive amount of world-building that goes into One Piece, mangaka Oda undoubtedly devotes much of his time to mapping out various characters by means of where they will appear and when (most likely ahead of time). This is done to such an extent that when these characters eventually move away from the main events of the plot, how they eventually return will have already been planned, so by the time they do come back, it will be with a vengeance.
Related: Shonen Jump Can’t Publish The Most Explicit Version of Blue Exorcist
Mangaka Kazue Kato brings this dynamic to Blue Exorcist with the reintroduction of a character named Reiji Shiratori in chapter 134. The first half of Reiji''s unexpected cameo adds some depth to his character, portraying him as a boy who so blindly believes that his father isn't avoiding him and is only away on business that when someone kindly tells him otherwise, he reacts vehemently, even violently, regardless of whether or not the person is elderly. But what matters from the perspective of One Piece's aforementioned formula is that, at the end of the chapter, a demon suddenly possesses his body.
Before this chapter of Blue Exorcist, Reiji had only been featured a few times. In fact, his first appearance happened towards the beginning of Blue Exorcist, for he's discovered to be a delinquent who's possessed by the demon
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