Many fans and viewers believe that maybe Eren Jaeger was not the protagonist of Attack on Titan, but Mikasa Ackerman was.
Attack on Titan's series finale isn't supposed to feel good - Polygon
Yuki Kaji lost his voice in this Attack on Titan episode
Attack on Titan: Eren Yeager / Characters - TV Tropes
Attack On Titan: 5 Ways Eren Yeager Is A Hero (& 5 He's A Villain)
Did chapter 139 of Attack on Titan assassinate Eren's character? - Quora
Eren Jaeger May Have Never Been Attack on Titan's True Protagonist
Eren Yeager
Eren Jaeger (Anime), Attack on Titan Wiki
What is the end goal of the character Eren Jaeger in the anime series Attack on Titan? - Quora
Eren Jaeger May Have Never Been Attack on Titan's True Protagonist
Eren Yeager Real Action Hero MEDICOM TOY (Pre-Owned In Box) Attack on Titan
At what point did you realise that Eren was the bad guy? : r/attackontitan
Attack on Titan: What happens to Eren in Attack on Titan? The life & death of AOT's protagonist explained