Souichi Yakumo is second in command at TERRA, with the rank of Major. He often takes command when Kunugi is not present. Souichi is fond of Ayato and believes that regardless of whether or not Ayato is a Mulian, he is still himself and thus, should be looked at as an individual. Souichi is kind and friendly to everyone, and Megumi misinterprets this as a chance for a relationship. Soichi is oblivious to Megumi's feelings and starts seeing Kim. Despite being softspoken and friendly, Souichi is an able commanding officer.   In other versions In the movie, Souichi has the same position within TERRA but is shown to be more "in the know." He does not appear in the manga.  wikipedia

In the year 2012 Japan was invaded by the Mu. Human-like beings from another dimension with blue blood. 
In the year 2015 Tokyo is attacked by invaders, who are repelled by a humanoid weapon called a Dolem. During the chaos, Ayato Kamina meets Reika Mishima, a classmate. 
During that same day, he is attacked by government officials but a woman named Haruka comes to his rescue, informing him that she was sent to get him by the Organization TERRA, and that Tokyo had been sealed in a time rift where time flows one third as fast as the outside world. 
He flees from Haruka onto a train where he sees Reika once more. Arriving at the Room of Rah, he follows her to a tremendous egg where the Dolem RahXephon is hatched from, and upon her singing his mother appears atop the Dolem that had stopped the TERRA Invasion. In the battle Ayato's mother is injured, and Ayato flees Tokyo Jupiter with Haruka upon seeing his mother's blue blood.

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Kouki Miyata is a Japanese voice actor who works for 81 Produce. He was formerly credited as Harunori Miyata (宮田始典, Miyata Harunori). He made his radio CM narration debut on 2 March 1993. He is also the Japanese dub voice of ''Phineas'' in the series ''Phineas and Ferb''

Ayato Kamina was separated from the girl he loved, Haruka Mishima, when an event occurred that was thought to have killed everyone outside of Tokyo. But one day three years later, invaders suddenly attacked the city. It was then that he meets an agent of TERRA, Haruka Shitow, who tells him that she will give him the truth about the world. It is the beginning of a series of strange events, which involve him activating a giant mecha, the RahXephon and finding out that many people, including his own mother, has blue blood, and that he was actually living in a self-encased dimension where time moves slower than that of the outside world.
 
(Source: Anime News Network)