Danbooru-based image board with a specialization in high-quality images.
Maeda-kun
Komori Kiri
Nozomu Itoshiki
takashi
Kotonon
kobushi abiru
tsunetsuki matoi
amakudari-sama aoyama_(sayonara_zetsubou_sensei) arai_chie eyepatch fujiyoshi_harumi fuura_kafuka haga_(sayonara_zetsubou_sensei) hito_nami hokuou ikkyuu_(sayonara_zetsubou_sensei) itoshiki_enishi itoshiki_kei itoshiki_majiru itoshiki_mikoto itoshiki_nozomu itoshiki_rin jinroku_(sayonara_zetsubou_sensei) kaga_ai kimura_kaere kino_kuniya kitsu_chiri kiyohiko kobushi_abiru komori_kiri kotonon kudou_jun li_nakanao maedax manseibashi_wataru marui_(sayonara_zetsubou_sensei) maruuchi_shouko megane mirucho mitama_mayo moto-sekiutsu_tarou nezu_miko niang_niang ookusa_manami otonashi_meru oura_kanako sayonara_zetsubou_sensei seifuku sekiutsu_maria_taro takashi_(sayonara_zetsubou_sensei) tokita_(sayonara_zetsubou_sensei) tsunetsuki_matoi usui_kagerou

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If only someone tagged everyone's names on the picture itself, there are a lot of people here i forgot and don't know.
(seriously, who are these people in the last row?) :D
This one has all the characters noted on the image http://danbooru.donmai.us/posts/627219