The Big O II - Recommendations

If you're looking for anime similar to The Big O II, you might like these titles.

Neon Genesis Evangelion

Neon Genesis Evangelion

In the future, a devastating event known as Second Impact has destroyed Tokyo as we know it, giving rise to Tokyo III - a city under siege by mysterious lifeforms known only as Angels. Mankind's only line of defense are the Evangelions, a set man-made machines piloted by a trio of fourteen year-old teenagers, Rei, Shinji, and Asuka. The fate of Japan and the entire world now lie with these three children, though they might not have the power to save the most important thing of all: each other.

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Akagitsune92 Akagitsune92 says...

Neon Genesis Evangelion and The Big O II are both quite similar. Both feature mecha robot fights in a post apocalyptic world, as well as a mind-f*ck storyline which will leave you asking more and more questions. 

Alien Defender Geo-Armor: Kishin Corps

Alien Defender Geo-Armor: Kishin Corps

Life isn't easy for Taishi; in the midst of World War 2, his parents have just been killed at the hands of the ruthless Kanto Army – but unfortunately for him that’s the least of his concerns: a sudden alien attack is threatening the entire world! Little does Taishi know that his father, Professor Tokamura, has entrusted him with a control system for a Geo-Armor Robot – the only weapon capable of fighting off the invaders. However, there are those who would use the Geo-Armor to win the war – rather than defend against the alien attack – and they will stop at nothing to obtain it...

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Funkgun Funkgun says...

Steam punk rivited mecanical robotic fighting fun.

The simplistic designs of the characters are only matched by the detailed designs of the mecha.

Giant Robo

Giant Robo

In the near future, a small team of scientists have solved the world’s energy problems with the Shizuma Device. While the development of the device was hampered by a chilling disaster, the device is now viewed as the ideal power supply; it is clean, recyclable, and can be used to power every device imaginable. However, the terrorist group Big Fire has found a way to recreate the disaster that was triggered during the item’s development, in every Shizuma Device around the world. It is up to InterPol, a group of justice specialists with extraordinary powers, to stop this nefarious plan and save the world with the help of their trump card known as Giant Robo and the young Kusama Daisaku, the crux of the robot’s power.

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Funkgun Funkgun says...

The Mecha are lumbering giants with designs that harken back to an older time.

The character designs on the humans looks simple and fresh. The animation in both is fairly decent OAV 90's style. 

Good action, both should work well with one another. 

Ergo Proxy

Ergo Proxy

In a futuristic world almost barren of life, mankind is confined to mechanized domed cities where A.I.’s control all aspects of life. In this world, humans are no longer born, they are manufactured in a production line; and alongside them live androids known as autoreivs. Within one of these domed sanctuaries named Romdeau lives Re-l Mayer, one of a few citizens who aren’t entirely prevented from thinking. Her grandfather's prominent position and the affection of the scientist Daedalus have left her more free will than is normally allowed, but Re-l has started to question the sanctity of the city and the citizens' perfect way of life. With mysterious beings known as proxies causing havoc and a man named Vincent causing great influence on her life, Re-l must travel outside of the city to find the answers she seeks and discover the mystery behind "the awakening".

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Casshern Sins

Casshern Sins

In a dark future, the world is in ruin and everything is slowly crumbling away into dust. Humanity is almost extinct, while robots desperately seek out new parts to replace their rusting bodies. Their only hope for survival is to devour the one known as Casshern… or so they believe. Meanwhile, Casshern himself has lost all memory of his past. Why are these robots attacking him? Did he really kill the one known as Luna; the Sun that was called Moon? And why is he, alone, unaffected and undamaged by the ruin?

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Solty Rei

Solty Rei

Twelve years ago, an incident known as "Blast Fall" unleashed major destruction and chaos. Now, years have passed, and mankind has learned to adapt by incorporating cybernetic limbs into its citizens. Roy Revent is a bounty hunter known for his violent acts towards criminals due to the loss of his daughter in Blast Fall; and when a criminal tries to take revenge on Roy, an unknown girl falls from the sky and saves him. She has no memory of who she is, or where she came from. With the help of Miranda, his boss and landlord, he takes in the girl and gives her a name of Solty. What is the real identity of Solty, and what caused Blast Fall?

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Fafner: Heaven and Earth

Fafner: Heaven and Earth

Two years after the end of the original Soukyuu no Fafner TV series, Tatsumiya Island and its surviving residents have returned to some semblance of recovery. However, things have become desperate for our hero, Kazuki; nearly blind now, and partially crippled from his battles with the Festum two years earlier, he clings to the promise his fallen friend Soushi made to him to return to the island and set things right again. Kazuki's hopes flare when a lifeform is detected within an unmanned submarine that comes floating into Tatsumiya Bay one night, but the person aboard isn't Soushi; it is a mysterious "boy" named Misao Kurusu who may not be entirely human, and who claims to have been sent by Soushi. With Misao's arrival, hostilities break out anew between the Human Army and the Festum, and the Fafner pilots are thrown into the most desperate battle of their lives--this time, with the fate of TWO races riding on their shoulders.

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Heat Guy J

Heat Guy J

In the futuristic city of Judoh, some dangers are too much for the police--they require Special Force agent Daisuke Aurora and his robot partner J! When the city's massive underworld is rocked by upheaval, Daisuke and J must struggle to contain gang bosses battling for supremacy. But is there more going on than meets the eye? Who is behind the sudden rise of a previously minor politican to the top of Judoh's underground? How are the mysterious Celestials, who watch Judoh from above, involved? And what secrets lie hidden in Daisuke's own past--and inside J's memory?

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NieR:Automata Ver1.1a: Part II

NieR:Automata Ver1.1a: Part II

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Vexille: 2077 Isolation of Japan

Vexille: 2077 Isolation of Japan

Disturbed by Japan’s emergence as the de facto world leader in robotics, the United Nations instituted an international treaty requiring stringent regulations. When vocal objections failed to overturn the decision, Japan chose to withdraw from the UN and vanished from world view in a self-imposed isolation made possible by an impenetrable electromagnetic barrier. Now, ten years later in 2067, the only means of contact between Japan and the world belongs to Daiwa Heavy Industries, a powerful corporation monopolizing the world’s robotics market. The uneasy truce comes under question when SWORD, a U.S. special forces unit, finds disturbing evidence that Japan may have sinister designs for the rest of the world. SWORD must now infiltrate Japan to separate fact from fiction, but is anyone prepared for the truth?

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