Sanger Zonvolt debuts in Divine Wars as the leader of the ATX team, pilot of the Grungust Type-0. Prior to the series, he was one of the Agressors, along with Kai Kitamura, Elzam Von Branstein, Gilliam Jager and Tempest Hawker.  In Divine Wars:  ~!While he initially fought with the ATX team, he is captured by the DC and meets with their leader, Bian Zoldark. Bian convinces Sanger to join them to reform the federation and fight off the incoming Aerogator invasion. As such, Sanger fights against his former teammates in the DC war, alongside his old friend, Elzam. However, when Bian falls and the DC is taken over by Adler Koch, he actively resists the new leader, and indeed, single handedly defeats him. After this incident, he is remains largely unseen, becoming a "shadow" to the Hiryu and Hagane, along with Elzam and the Kurogane, although he emerges during the L5 campaign and assists in the final strike against the Aerogators.!~  In The Inspectors:  ~! Sanger returns to hiding, and is given the Grungust Type-3, along with a new Zankanto, by Elzam (now under the pseudonym "Ratsel"). He uses this to fight against the Shadow Mirrors, assisting Gilliam's counter offensive against the other-worldy group. In this conflict, he is brought face-to-face with Wodan Ymir, a man who is almost exactly the same as Sanger himself (and indeed, many had thought him to actually be Sanger until he came out of hiding). In an effort to retake the Tesla Reich Institute, Sanger's Type 3 is destroyed, but he receives a new unit, the "Dynamic General Guardian" unit 1, or, appropriately, the "DyGenGuar", which he uses for the rest of the series. His next most noteworthy battle is against Wodan, who is revealed to be a cyborg of Sanger himself (from the Shadow Mirror's parallel world), a duel which Sanger wins. After this, Sanger continues to assist the protagonists for the remainder of the series, before once again returning to the shadows with Ratsel.!~ Signature lines 「黙れ！そして聞け！」(Shut up! And listen!) 「我が名はゼンガー＝ゾンボルト、悪を断つ剣なり！」(My name is Sanger Zonvolt, the sword that smites evil!) 「我が斬艦刀に、断てぬものなし」(My Zankantô can cut anything!)

With many of its central personnel lost in the war, the Earth Federation Government is forced to rebuild, and Brian Midcrid, president of the Unified Colonies, takes the position of its president. During an emergency session of the Federation Diet, he publicly acknowledges the existence of extraterrestials, and reveals the events of the L5 campaign to the masses in what will later come to be called the "Tokyo Declaration". He goes on to state that these aliens pose a serious threat to humanity. 
(Source: Crunchyroll)

Kenichi Ono is a seiyuu, tarento, and actor from Tokyo.

It is two hundred years after the beginning of the Space Era, when human civilization on Earth began expanding into space. However, by the start of the 21st century, two meteors struck the planet, sending humanity into chaos. By the year 179 of the Space Era, secret technology, dubbed Extra-Over Technology, or EOT, was discovered by the Earth Federal Government within a third meteor that hit Earth in the Marquesas Islands of the South Pacific. Dr. Bian Zoldark, head of the EOTI Institute (Extra-Over Technological Investigative Institute), had evidence the creators of the EOT were heading to Earth, in order to reclaim it...or worse, invade the planet. In order to defend humanity from extraterrestrial threats, the government begins to research and develop humanoid mecha called Personal Troopers.
 
(Source: Anime News Network)

Dr. Jurgen of DC developed a global defense system to combat potential alien threats. This system has two elements. First is the VTX-001 Vartoul unmanned anti alien PT. Governing these drones is the ODE worldwide network system. However, this system has a noteworthy secret. A living human is needed to control the ODE core. Furthermore, the ODE core needs human organs to support itself. At the present day, the drone have gone on a mass abduction spree. Kyosuke and co has been sent in to take care of the problem.
 
(Source: Anime News Network)