Since I'm highly biased towards this title, I thought I might as well kick off the general thread for it which you can discuss both the manga and anime (when it airs next season) in here.
Shingeki no Kyojin
Summary (taken from Wikipedia):
Attack on Titan (進撃の巨人 Shingeki no Kyojin) is a Japanese manga series written and illustrated by Hajime Isayama, which is set in a world where the remains of the human population live inside cities surrounded by enormous walls due to the sudden appearance of the Titans, gigantic humanoid creatures who devour humans seemingly without reason. The story centers around the life of Eren Jaeger and his adoptive sister Mikasa Ackerman, whose lives are changed forever after the appearance of a colossal titan brings about the destruction of their home and the death of their mother.
- Main -
Eren Yaeger - Yuki Kaji
Mikasa Ackerman - Yui Ishikawa
Armin Arelet - Marina Inoue
- Supporting -
Marco Bodt - Ryota Ohsaka
Sasha Braus - Yuu Kobayashi
Jean Kirschtein - Kishou Taniyama
Annie Leonhardt - Yuu Shimamura
Historia Reiss - Shiori Mikami
Conny Springer - Hiro Shimono
A few useful links concerning Shingeki no Kyojin:
Just as a side note, spoiler discussion is fine if you've read the manga, just ensure to use the spoiler bbcode so that those who have not read the manga and are currently waiting on the anime will be able to enjoy it spoiler-free as well.