Here are some more facts!

 1. One Piece, one of the most popular manga in Japan, was supposed to run for maximum 5 years, but Oda ( Author of OP) continued it till date (18 years) and it's still going on without any sign of stopping. Yay! :) :) :)

2. You remember Orochimaru from the anime Naruto and Naruto Shippuden? Orochimaru is known for having a SUPER deep voice, so many assumed that the voice actor was a guy with a serious throat infection. NOPE! The voice actor was actually female. I DON'T BELIEVE IT!  

3. In the original draft of the anime Your lie in April, instead of Karoi dying at the end, she was supposed to have survived the surgery and then, later on, marry Kousei. Tsubaki was going to be with Watari. Although the author wanted Karoi to live, the editors said it would be better to kill her off. 

4. Assassination Classroom has many cross-anime references. I still remember the time Koro-Sensei wore a Naruto headband and one of the students was like, "We're studying NARUTO?" XD. There was another moment when Koro-Sensei created his doubles and then started to cosplay as certain anime characters. The scene only lasts a few seconds though, so it's easy to miss. So far I've noticed Sasuke, Sakura, Tamaki, Goku, Ichigo, Rin (from Blue Exorcist), and a billion blue-haired characters. There are so many others though, it's just that they are had to see. You can also see Karma playing a one-piece game on his phone while class was in session. Overall, there are like a billion other anime-references in AssClass. May be time to rewatch! Lol.