Here is some of my favorite manga :)

Shingeki no Kyojin

Several hundred years ago, humans were nearly exterminated by giants. Giants are typically several stories tall, seem to have no intelligence, devour human beings and, worst of all, seem to do it for the pleasure rather than as a food source. A small percentage of humanity survived by walling themselves in a city protected by extremely high walls, even taller than the biggest of giants.

Flash forward to the present and the city has not seen a giant in over 100 years. Teenage boy Elen and his foster sister Mikasa witness something horrific as the city walls are destroyed by a super giant that appears out of thin air. As the smaller giants flood the city, the two kids watch in horror as their mother is eaten alive. Elen vows that he will murder every single giant and take revenge for all of mankind.

English: Attack on Titan

Genres: Action, Fantasy, Horror, Shounen

Authors: Isayama, Hajime

This is really one of the best mangas i have red and i have red alot.
You can start reading from - here http://www.mangareader.net/shingeki-no-kyojin

Eden no Ori

Akira and his classmates are on a plane that crashes on an island inhabited by a species thought to have been extinct. Some of his classmates are eaten alive, some kill others in desperation. Now Akira and a few other survivors are trying to stay alive through what seems to be a horrible nightmare.

Genres: Action, Adventure, Ecchi, Fantasy, Shounen

Authors: Yamada, Keiyou

This is again an AMAZING manga

You can start reading from - http://www.mangareader.net/213/cage-of-eden.html

Hajime no Ippo

Makunouchi Ippo has been bullied his entire life. Constantly running errands and being beaten up by his classmates, Ippo has always dreamed of changing himself, but never has the passion to act upon it. One day, in the midst of yet another bullying, Ippo is saved by Takamura Mamoru, who happens to be a boxer. Ippo faints from his injuries and is brought to Takamura boxing gym to recover. As he regains consciousness, he is awed and amazed at his new surroundings in the gym, though lacks confidence to attempt anything. Takamura places a photo of Ippo’s classmate on a punching bag and forces him to punch it. It is only then that Ippo feels something stir inside him and eventually asks Takamura to train him in boxing. Thinking that Ippo does not have what it takes, Takamura gives him a task deemed impossible and gives him a one week time limit. With a sudden desire to get stronger, for himself and his hard working mother, Ippo trains relentlessly to accomplish the task within the time limit. Thus Ippo’s journey to the top of the boxing world begins.

You can start reading from -

http://www.mangareader.net/115/hajime-no-ippo.html

Published: Feb 17, 1990 to ?

Genres: Action, Comedy, Drama, Shounen, Sports

Authors: Morikawa, George

I am reading this Manga from 4 - 5 years and it is just AMAZING. It's the typical MAN manga. Its just amazing :)