Thread:SihannaIM/@comment-27247962-20160617225113/@comment-27247962-20160630154618

durarara Izaya, God Eater has a scientist like that I think, but we don't yet know his identity. Nashetania from Rokka No Yuusha, The Teacher from Boku Dake ga inai Machi, Bungou stray dogs just identified a guy that has similarities to Furuta. Even Sakamoto has a guy in it, but just a pushover in comparison too Furuta, Monogatari series has Ougi & Noragami has a guy who is about the be reveal his name.

So it seems it's quite a common character to reappear. But among those characters, there are always those that jump out. Furuta & Hisoka would be those. They are unique even among that breed of characters.