Manga Search: Can anyone help me?

here are a few I know of that fit your description, though I don't know how much you'll like them:

Gosick

http://www.mangareader.net/gosick

Set in a fictional European country in 1924, a Japanese exchange student meets a mysterious, brilliant girl who only leaves the library to sleep. Her brother, a detective, relies on her mind to solve difficult mysteries, several of which draw her away from the library. With a drop of sweet romance, you will immediately become addicted to Gosick!!!

TISTA

http://manga.animea.net/tista.html

The series is set in New York City, and the main character is a young girl named Tista. In the day, she is a shy, introvert, church-going student whose ambition in life is to become a teacher. At night, she assassinates criminals as her alter-ego, Sister Militia. A special feature of her eyes give her the ability to spot a target from miles away, be it moving or stationary. Once she's spotted her target, it's one-shot one-kill. Why is Tista killing for the church? What happened to her father? How did she get those eyes?

3 Hearts

http://www.mangahere.com/manga/3_hearts/

Thief Jin Tonic seeks the mysterious treasures known as "The Three Hearts". One night a mysterious woman falls from the sky claiming to be an escaped Princess from a sacked castle. As fate would have it, she has one of The Hearts. But is she really who she says she is? And will Jin Tonic let her live to fulfill her mission? Show less

Shitsurakuen

http://www.mangareader.net/621/shitsurakuen.html

Himoto Sora is a transfer student with a sense of justice and dreams of becoming a knight. Upon arriving at Utopia Gakuen, she learns of a virtual reality-like game played by the male students in which they use girls as weapons in battles for status and treat them as commodities. Seeing one of these girls being abused she steps in and though some sort of error unwittingly becomes the first female participant of the game.

Silver (Fujita Kazuko)

http://manga.animea.net/silver-fujita-kazuko-.html

Geraldine Francis is the innocent daughter of a wealthy aristocrat. Being sheltered all her life, she is oblivious to her cousin Charles' true intentions when he lures her in and makes her fall hopelessly in love with him. It is only after the murder of her father that she realizes his love was nothing but love for the money and the land that came with her name. She vows revenge, and she throws away her past in order to become "Silver," the perfect woman. With a new face, and a new lease on life, she will turn the tables on the man whom she once loved so that this time, it is he who will be left with nothing. Adaptation of English fiction Silver by Penny Jordan.

Tonari no Kaibutsu-kun

http://www.mangareader.net/tonari-no-kaibutsu-kun

Mizutani Shizuku is the type of person who only cares for her own grades. But when she accidentally delivers the lesson notes to Yoshida Haru, Haru becomes convinced they are friends. Haru turns out to have a very innocent personality, but who would've thought that Haru would actually confess to Shizuku? A cold-hearted girl x super troublemaker romance with a fresh new perspective,

Tokage Ouji

http://citymanga.com/tokage_ouji/

Princess Canary is to go to an omiai with Prince Heath, a prince from another kingdom known for his flirting with women, drinking and gambling. She agrees but only to have the chance to preach to him about the way he rules his kingdom. Prince Heath is completely opposed to the idea and instead of going, gives his pet lizard a potion to turn him into an exact duplicate so that he may replace him.

But when the lizard and Princess Canary meet, she is surprised to find herself falling in love with the prince thinking the rumours may not be true at all. What will happen when she discovers that the prince she’s falling in love with is actually a lizard? And what about the lizard, himself? Will he be content living as a lizard once he’s had a taste of what being human is like?

hope that helped :D

Sorry but to be realistic theres no anime that has everything u said.

i suggest u to jst watch any anime, because then only u might find another type of anime thats amazing, u will never know if u never try different types of anime. I was also like that, when i reallllly liked one type of anime, i thought i would only search something similar. but i realize any anime could be good. i hated romance for instance, but realize there are many awesome romantic anime.

so u should jst try any anime.

it s a hard request but i would still recommend angel beats