Shion

Flower: Tartarian Aster (Grows well in poor soil)
~!Reincarnated as: Rin Kobayashi!~

Shion was a war orphan born on the moon of Tess who was rescued and sent to Shia from the middle of the conflict on Tess for control of the Homeworld. Shion possessed strong psychic powers and controlled them with ease. He also had a first-rate mind and became a renowned engineer. Shion had serious emotional problems. As an orphan, he did not have a family until he was taken in by a foster father around age six. He was slowly but surely starting to trust and love his foster father, when a terrible accident occurred and his foster father died. He never truly trusted any of his friends, not even his childhood friend Gyokuran, whom Shion ended up hating because of Gyokuran's moral upstandingness and that he was everything that Shion could never be.

Shion was the only male member of the team who did not fawn over Mokuren. In fact, he completely despised her.
~!When it became clear to him that Gyokuran, his childhood rival, was completely obsessed with Mokuren, Shion decided to take advantage of this while sitting in the brig of the Moon Base by "getting to Mokuren first" in order to destroy Gyokuran's being on the most basic level. As a side benefit of this action, he intended to defile the sanctity of the Sarjalim faith, which had abandoned him so many times in the past, by ruining the last of Sarjalim's sacred avatars. And so, he struck a bargain with Mokuren when she came by to give him his lunch one day: "I love you, give up your Kiches powers (virginity) and I will reconcile with Gyokuran, no matter what it takes.". To this deal, surprisingly, Mokuren agreed. But during the act, Mokuren had a change of heart and resisted, but Shion did not listen and continued, effectively raping her. Afterwards, Mokuren took up ill and Gyokuran, enraged at Shion's perceived actions, demanded permanent exile for Shion. Mokuren, upon hearing of this, pulled herself together and declared that she and Shion had become engaged, and that Gyokuran would let him out of the brig NOW. At this pronouncement, Gyokuran was forced to release Shion from the brig, and Mokuren and Shion moved into Mokuren's quarters together. It is the confusion surrounding these events by all parties involved and not involved that leads to the underlying cause of the dark and terrible nature of the plot of the manga series.!~

Shion was the last of the moon team to die. He had been inoculated against the virus that was killing them, so lived alone for nine years after Mokuren died. He was unable to commit suicide because Mokuren warned him that people who commit suicide will not be reincarnated. ~!This is why Rin is nine years younger than everyone else.!~ After Mokuren's death, Shion went insane. The cold, ruthless side that Rin sometimes displays is Shion's, and his plan is to make Shukaido suffer.
In the sequel, "Boku wo Tsutsumu Tsuki no Hikari":
~!which takes place fifteen years later, Rin is married to Alice and they have two children: a son named Ren and later a daughter named Chimako. Rin was 16 when his son was born, and was 18 when he married Alice.!~

(Source: Wikipedia)