Grisha Yeager, Villains Wiki

 Eren! You'll understand the truth someday, if you visit the basement! It will be a harsh, painful journey but you must reach it! If you want to save Mikasa, Armin, and everyone else you must learn to control this ability!Grisha to his son Eren before turning him into a Titan. I came here knowing that you would be ignorant on that subject. It's a consequence of the way you've been shackled by the vow renouncing war. You can't use the Founder's full power either. The future is already long

The 5 Best (& 5 Worst) Anime Villains Of The 2010s

Why did Eren turn evil?

Attack on Titan: Marley / Characters - TV Tropes

Attack on Titan Zeke's death explained

Rod Reiss Villains+BreezeWiki

Eren Yeager - Wikipedia

Is Grisha Jaegar a villain? - Quora

Grisha Yeager, Attack on Titan Wiki

Death Battle Prelude: Eren Yeager vs K.R. Blade by vh1660924 on DeviantArt