Koro-sensei, the seemingly unbeatable target and arguably the real protagonist of the series.
Earlier this year, in my winter 2015 anime season preview, I mentioned that among the most popular of series that I, and I am sure many others, were looking forward to, was Assassination Classroom. 暗殺教室 (Ansatsu Kyoushitsu, hereafter referred to as AK) had extremely huge hype surrounding its animation release thanks to the manga. One of the reason I purported back then for such a large following might be the idea that, well, students do sometimes dream about being able to kill their teachers, and what better premise than an environment where you are supposed to do just that?
However, as I continued watching the series, I have come to a different conclusion. In fact, this post is perhaps long overdue, for my first ideas regarding a more possible reason (in my opinion, at least) were formulated around episode 3. I have allowed the idea time to mature, and I have come to firmly believe, indeed, that what I have thought since then is the real reason why this show is so well-liked. Indulge me, please.
Spoilers alert: Read on at your own risk.