Mr. Howard

Mr Howard is Spongebob's High School Teacher, and also Mrs. Puff's current husband in season 6 of the anime, do not cross him or you will get double detention. In Episode 921 when he gave Mrs. Puff's class sextuple detention, because Nate slammed his locker, sadly his tyranny came to an end when Patback blew up the school. It's primarily known as being #4 in the Top 10 Saddest Anime Deaths by WatchMojo.com, there are rumors the writers are in secret talks of reviving him