Hello!
I've been anticipating writing this review for a while, but wanted to get some other reviews out first, plus as I've watched smaller anime's I've also wanted to review those. If you look on my Anime List you'll see how highly I've ranked Season 2 of this show and I'll explain why in that review, but first I want to discuss this first Season. Spoilers Ahead DUH!

The general gist of the show is simple and enjoyable, a classroom of students tasked with killing their teacher, instantly sets up for a promising show filled with strategy and funny moments, and it does deliver this well. The first bunch of episodes were very enjoyable, as it was a new anime with a fun cast of characters and good plot. When it started to slow, they introduced Karma who instantly changes the speed of the story as he is the first to actually damage Koro-Sensei which caught even me off guard and hyped me up. Not only that, but he is a completely new personality and brings new fun moments and relationships.

About halfway through the show i began to lose interest, it felt that there was nothing going on, no big plots, no sudden changes. While i did enjoy the Exam arc against Asano, who was another good introduction, the show did begin to lose me, however i was brought back in even stronger than previously by the Island Arc. This was a great Arc as it showed a massive elaborate plan that works to a point, it was great to watch that occur and then a complete twist occurs, with the lives of the beloved students being put in a life-threatening situation and we finally get to see all the characters put their learnt skills to the test in a dangerous situation. This whole Island Arc compeltly changed my view on the Series, both the genius Assassination and the entire Hotel Arc of fights and Outsmarting, down to Nagisa's final battle.

Character-wise, for this first Season it introduces 30 or so characters, some of them are easy to remember compared to others and even now I could probably only name a Maximum of 10 if that. This unfortunately was always going to be the case with such an abundant character pool. Also i felt it wasn't clear in this first season who the Main character was until towards the End. There are 3 characters with "Anime Hair" those being Nagisa, Karma and Kayano and throughout the series it centers on different characters throughout so other than Koro-Sensei I felt there wasn't an abundance of any one character more than others.The characters themselves are all extremely enjoyable each with their own traits, Nagisa is quiet and Shy, Karma is arrogant and Sly, Koro-Sensei is lovable and funny. All the characters are easy to love and I wouldn't say any would be easily replaceable.

The animation style is actually really good and while it isn't going to be some masterpiece, for the show it is for, it's a perfect fit and enjoyable to watch.

While I may have lost interest part-way through, there were still some good Arcs other than the Island, the other School Trip Arc, Exams, Professor Bitch, Training with Karasuma and Takaoka. Overall, the first season was still greatly enjoyable, even when interest dropped, it did remain an enjoyable show and picked back up very strongly and quickly.