Yandere Club - You will only look at me, RIGHT~? ❤

Mirai Nikki (Future Diary) - Yuno Gasai as the yandere character.

Link: http://www.mangafox.com/manga/mirai_nikki/

Koharu no Hibi - A hardcore stalker named Koharu.

Link: http://www.batoto.net/comic/_/comics/koharu-no-hibi-r190

Oniichan Control - Noa loves her brother very much. Yes, incest.

Link: http://www.mangafox.com/manga/oniichan_control/

Hana wa Knife o Mi ni Matou - Broken-hearted Kako Saeki tries to do anything to take back her beloved.

Link: http://www.mangafox.com/manga/hana_wa_knife_o_mi_ni_matou/

Haru to Natsu - Haruna has yandere tendencies. She usually shows her yandere side whenever her twin sister Natsumi tries to take Makoto away from her. Let the battle of the twins begin!

Link: http://www.mangafox.com/manga/haru_to_natsu/

School Days - Yep. Makoto is still a jerk, as usual. Kotonoha and Sekai are both yandere.

Link: http://www.mangafox.com/manga/school_days/

Saitama Chainsaw Shoujo - This is quite a gory manga. Fumio was dumped by Takumi. Instead of accepting being dumped or trying to win back Takumi's love, Fumio takes a third option. She herself acknowledges she has jealousy issues, when she notices she enjoys slashing the girls more using her chainsaw.

Link: http://www.mangafox.com/manga/saitama_chainsaw_shoujo/

Sayonara Zetsubou Sensei - Matoi Tsunetsuki and Chiri Kitsu as potential yandere characters.

Link: http://www.mangafox.com/manga/sayonara_zetsubou_sensei/

Re:Birth - The Lunatic Taker - My second favorite among the yandere manga. Ayaka is very protective on her little brother Reiji. Does it sounds familiar to Oniichan Control? Yes, sisterly love again. By the way, the artwork is very nice, as well as the storyline.

Link: http://www.mangafox.com/manga/re_birth_the_lunatic_taker/

Doubt (Manga) - I am not sure if Mitsuki can be considered as one. You will understand after reading the last 5 chapters of the manga.

Link: http://www.mangafox.com/manga/doubt_tonogai_yoshiki/