Here are my favorite picks for anime like Buddy Complex. Keep in my the list is in no particular order. Enjoy the recommendations!
True Calendar (T.C.) 71—a new age where 70% of the human population lives in space thanks to the development of “Dyson Sphere”, a city in space.
The world is divided into two main powers: The Dorssia Military Pact Federation, a power which grew out of a military alliance, and the Atlantic Rim United States (ARUS), which grew in power as it expanded its trade agreements. The minor nation of JIOR has declared neutrality between these two forces and maintains its peace through economic prosperity.
Within the JIOR’s Sphere, Haruto Tokishima lived an ordinary life as a high school student in the division known as “Module 77″—until the Dorssian military begins their sudden invasion!
But the whole world will be shaken when Haruto meets the mysterious humanoid weapon, Valvrave! (Source: Aniplex USA)
The story begins in the distant future in the far reaches of the galaxy. The Human Galactic Alliance has been constantly fighting for its survival against a grotesque race of beings called “Hidiaazu.” During an intense battle, the young lieutenant Ledo and his humanoid mobile weapon Chamber are swallowed up into a distortion of time and space. Waking from his artificially induced hibernation, Ledo realizes that he has arrived on Earth, the planet on the lost frontier. On this planet that was completely flooded by the seas, people live in fleets of giant ships, salvaging relics from the seas’ depths in order to survive. Ledo arrives on one of the fleets called Gargantia. With no knowledge of the planet’s history or culture, he is forced to live alongside Amy, a 15-year-old girl who serves as a messenger aboard the Gargantia fleet. To Ledo, who has lived a life where he knows nothing but fighting, these days of peace continue to surprise him. (Source: ANN)
In 1972, the Apollo 17 mission found a hypergate to Mars on the surface of the moon. Upon landing, astronauts discovered an enchanted utility later referred to as “Aldnoah,” giving the astronauts a status of superiority. Soon, many humans have relocated to Mars, and have adapted to the name “Martians.” After Princess Asseylum, a royal Martian princess, descends onto Earth in an attempt to create a treaty between both planets, a war breaks out between Earth and Mars, and Martian soldiers begin to descend from the sky, riding steel giants, intent on exterminating humanity.
Renton Thurston is a 14-year-old boy who lived with his mechanic grandfather in a backwater town. Every day he dreamed of being with the mercenary “Light Finding Operation (LFO)” aircraft pilot group “Gekkostate” and riding “Trapar” particle waves—a sport called “reffing”—with their charismatic leader Holland, especially when faced with his father’s acclaimed past or his grandfather’s desire to protect him. When a young girl named Eureka riding the original LFO, the “Nirvash typeZERO,” asks his grandfather for a tune-up, she inadvertently brings the attention of the military to the garage; as a result, the garage is destroyed and Renton is forced to deliver a new type of interface—the “Amita Drive”—to the Nirvash. After a heated fight in which the Nirvash destroys the military LFOs by unleashing an immense amount of power, Renton is invited into Gekkostate. However, he quickly realizes that behind the facade of a traveling group of mercenaries is a very bitter reality. (Source: ANN)
The story takes place in Tokyo in 2039, after the outbreak of the “Apocalypse Virus” during what became known as the “Lost Christmas” of 2029. Since then, Japan has been under the control of the multinational organization called GHQ.
Ouma Shu is a 17-year-old boy who mistakenly obtains a rare and great power. He can use this power, “The Right Hand of the King,” to extract “voids,” or tools/weapons that are the manifestations of peoples’ hearts.
He has been rather shy since a childhood tragedy, but both his personality and life change forever when he meets a girl named Yuzuriha Inori, a member of the rebel group called “the Undertakers,” whose members seek the restoration of self-government in Japan via the ousting of GHQ.
In the year Universal Century 0079, humanity lives in space colonies called Sides. Side 3, the Principality of Zeon, has declared war on the Earth Federation. After the intial fighting, an 8-month stalemate occured. However that stalemate breaks when Amuro Ray stumbles into the Gundam, the Earth Federation’s secret weapon. Now Amuro and the crew of White Base must stand up to Zeon in order to end the war. (Source: ANN)
References: MyAnimeList, Wiki, ANN