Darling in the Franxx is one of the most underrated anime. It has so many things to offer like Romance, action, twists and robots. This anime will blow your mind in the end.
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Mobile Suit Gundam
Mobile Suit Gundam is one of the classic anime from the 2000s. This is another underrated anime with good action and storyline, with the mega robot and other advanced teach.
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Code Geass
If you like anime with serious story and and characters then you should check this out. Code Geass has amazing action and storyline with Robotic weapons and more.
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Gurren lagann
Gurren Lagann is another classic mecha anime with good characters and a storyline. The story follows two teenagers who want to go to the surface by using a robot called Lagann.
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Neon Genesis Evangelion
Neon Genesis Evangelion is another popular anime from the 2000s and it is popular for its amazing storytelling and action. This anime also has a robot fight scene.
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If you want action, mystery, or thriller then you should watch this anime. You'll not be ready for the ending, and it also has robots and other amazing stuff. This anime is about the war between two countries
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Brave Bang Bravern
The story follows a joint military venture between Japan and America, where they are suddenly attacked by a giant alien robot. Later a talking robot named Bravern helps them to fight.
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Promare
This is not an anime but a must-watch action-packed movie. The animation and action of this movie will blow your mind and keep you interested all the time.