IMPORTANT INFORMATION FOR THE ANIME!!! PLEASE READ!!!
Eren is a titan.
Reiner is the armored titan
Bertolt is the colossal titan
Annie is the female titan
Ymir is the monster titan
The walls surrounding the city are full of giant titans (you'll see it later on when one of the walls get damaged).
Anon is the god of titans
Everybody living in the towns and villages turn into titans and attack the main city!