The story of Sayonara, Zetsubou-Sensei revolves around a pessimistic high school teacher named Itoshiki Nozomu. Tired with life, he decides to end it all by hanging himself on a sakura tree, not counting on getting saved by his extremely optimistic student, Fuura Kafuka. Nozomu later finds out that his entire homeroom class has different, and extreme personality quirks that he must overcome.
I'm not familiar with the series, so I can't really name all of the students shown here. Can you name each and every last character in the photo?