Attack on Titan is an anime adapted from the manga Shingeki no kyojin (attack on titan). The first episode aired on April 7, 2013, and the manga was released in 2009 and finished in 2021. It was all written by Hajime Isayama and Ryo Suzukaze. The anime has currently 85 episodes and the manga has 34 volumes.
The anime is about when man-eating Titans first appeared 100 years ago, humans found safety behind massive walls that stopped the giants in their tracks. But the safety they have had for so long is threatened when a colossal Titan smashes through the barriers, causing a flood of the giants into what had been the humans’ safe zone. During the carnage that follows, soldier Eren Jaeger sees one of the creatures devour his mother, which leads him to vow that he will kill every Titan. He enlists some friends who survived to help him, and that group is humanity’s last hope for avoiding extinction at the hands of the monsters.
There are also nine titan shifters with different unique abilities and looks. Each titan shifter’s titan will look different even with the same titan that’s why past users of the same titan look different with the same titan. Also when a user inherits the titans they see the memories of the past users. Also, only users of royal blood can have even more special power like controlling titans. Only the eldians or subjects of ymir or the devils (marleyans call them devils). The nine titans are the Founding, the armored, the attack, the beast, the cart, the colossus, the female, the jaw and war hammer titans.