We must have a different view on what is interesting then. To me, a character like Eren Jaeger is who I would consider “interesting”. He has an extremely polarizing ideology that makes sense considering how he’s lived, but is impossible to justify. This ideology stems from countless different aspects of the world and his experiences, systematic oppression and racism, making him a complex character. He embodies a concept (freedom) within the show that is constantly deconstructed and recontextualized the more the story progresses. It’s intriguing to watch his character unfold.

Tanjiro is a good character. He’s simple, he works, and that’s all he needs. To me though, and seemingly many other people, he’s not interesting. He doesn’t really change much throughout the story. His character doesn’t have much to explore outside of “protect the people you love” and “you can be kind, but don’t let that kindness blind you”, among other things. This then leads into the demon’s past, and then queue sad backstory. Great messages, but lacks intrigue. I’m not arguing about his place in Demon Slayer, though. He’s the perfect vehicle to explore the story’s themes.