* Popularity: Measured by viewership, merchandise sales, social media buzz, etc.
* Critical Acclaim: Based on awards, critical reviews, and overall reception.
* Cultural Impact: Considering how the series affected the anime industry, pop culture, and broader society.
However, based on a combination of these factors, here are some strong contenders for the biggest anime hit series of the last decade:
* Attack on Titan: This post-apocalyptic action series achieved global recognition with its intense story, stunning animation, and memorable characters. It topped streaming charts, generated significant merchandise sales, and even influenced fashion trends.
* Demon Slayer: Kimetsu no Yaiba: This action fantasy anime became a phenomenon, breaking records for box office sales and generating massive merchandise revenue. Its stunning visuals, captivating story, and beloved characters resonated with fans worldwide.
* My Hero Academia: This superhero anime has become a cultural touchstone, popular with both younger and older audiences. Its engaging characters, compelling world-building, and themes of perseverance have resonated widely.
* Jujutsu Kaisen: This supernatural action series quickly gained popularity for its unique and compelling story, intricate world-building, and stylish animation. It has seen a significant surge in popularity in recent years.
* Tokyo Revengers: This time-travel action series captivated viewers with its complex plot, intense action, and relatable characters. It garnered a dedicated fanbase and has been a significant hit both domestically and internationally.
Ultimately, the "biggest" anime hit series of the last decade is a matter of opinion and interpretation. Each of these series has achieved incredible success in its own right and left a lasting impact on the anime landscape.