I NEED A MANGA!

MeruPuri
Darling Only You
Charming Junkie
Black Bird
Ipaasha
爱情 Gashapon
The Bride Of The Water God
100% Perfect Girl
Hapi Mari
7 Jikanme Rhapsody
7th Period Is A Secret
Kiken Junai D.N.A.
The Honeybee Earl And The 花 Dress
Ginrou No Sakura
Oukan Latte Art
Faster Than A Kiss
Pandora Hearts
Hanatsuki Hime
Goshimei Arigatou Gozaimasu

WARNING: If 你 don't like romance mangas than don't read any of the mangas I suggested ;)

Well, Black Bird is a really good one (shoujo; romantic; with demons)
Higurashi When they Cry (mystery, horror) 9happens to be one of my fave mangas and anime)
Cafe Occult (mystery; fantasy)
Gentleman's Alliance 交叉, 十字架 (shoujo; romantic)
Full Moon O Sagashite (shoujo; romantic; fantasy; drama)
Kamikaze Kaitou Jeanne (mahou shoujo; romance; fantasy)
Pandora Hearts (fantasy; mystery; thriller) Again one of my favourite 日本漫画 and anime.
Hope 你 like them ~!

For Romance and Fantasy, try Cardcaptor Sakura. Dragon Ball Z, 火影忍者 and Bleach for Action and try Chobits and Higurashi for horror and Fantasy. Hope I helped 你 ^_^

Not sure how to classt these but The Darren Shan manga, 或者 the Megaman Megamix/Gigamix

suger suger run, shego chera, butie pop, death note, black butler, black blood brothers, bleach that's all i could think of right now.

Mangas I love:

Bleach
Naruto
Shingeki no kyojin
666 satan
+C sword and cornet
Fullmetal alchemist
D. Gray man
Ao no exorcist
Blazer drive

Strider Hiryu

Rosario + Vampire
Highschool DxD

Manga's are so much better than the 日本动漫

Hellsing
Soul Eater

Sorry. This will take a looong time for 你 to read. Enjoooy~

SHOUNEN|
_________|
ReLIFE (MY FAV <3) [comedy/school/slice of life/romance]
1/2 Prince (AWESOME) [comedy/action/adventure/genderbender/manhua/manhwa/romance/slice of life]
Fullmetal Alchemist (action/adventure/military/magic)
Owari no Seraph (action/military/magic/vampire) [picture]
Owari no Seraph: Guren Ichinose, 16-sai no Catastrophe (prequel to Owari no Seraph) [ongoing] {school/slice of life/demons/supernatural/action}
Nanatsu no Taizai (action/adventure/ecchi/romance)
Detective Conan (mystery/police/shounen/adventure)
Saijaku Muhai no Bahamut (mecha/magic/school/harem)
Magic Kaito 1412 (magic/slice of life/action)
Soul Eater (guys 或者 girls 日本漫画 tbh)
[school/magic/demons/action]
Ao no Exorcist (demons/action/comedy/shounen)
Hataraku Maou-sama! (comedy/slice of life/demons)
Baby Steps (guys 或者 girls 日本漫画 tbh) [sports/comedy/romance]

SHOUJO|
_______ |
晓组织 no Yona (comedy/romance/adventure)
Akagami no Shirayukihime (romance/comedy/fantasy)
日期 a Live (mecha/supernatural/slice of life/school/romance)
Cardcaptor Sakura (shoujo ai/shounen ai/romance/magic/slice of life/school) [a little gay don't worry nothing serious, just your typical magical girl manga]
Tokyo Mew Mew (magic/fantasy/slice of life/school/romance) [MY FIRST 日本漫画 O:]