The Emperor Titan of Attack on Titan

In the year 835, the chosen one, Eren Yeager, was born. That same year, Dunstan, reborn from another world, was reborn in Shiganshina District at the southern edge of Wall Maria. To his dismay, he became an orphan, but fortunately, a couple adopted him. He awakened a System to grow stronger, gained Ackerman blood and the ability to transform into a Titan, and met Eren and the other main characters. After rescuing Farlan and Isabel, he earned the approval of Captain Levi. Now, let’s see how he’ll make waves in the world of the Titans and forge a new legend!

I’m not great at writing introductions, so please read the story!