Attack on titan is legendary because of its superior writing and insane complicated plot and it has one of the most complex main characters eren saying demon slayer can replace it is a lie demon slayer don't have any of these aspects if you ask my opinion chainsaw man is way closer
We can't say it's the king of anime even if it's popular it's not top 5 most watched anime it didn't make the most money and even naruto an anime that came out in a age were anime wasn't these popular it made more money it don't have that much influence and it has no cultural impact it is just a great hit really good anime
