~*The One Who Is Torn Apart*~

The Id story... WARNING... MAJOR SP0ILERS!

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Id is the one with the fiery red hair (and a temper which is just as fiery if not more). Rather destructive, a good match for Grahf, I thought. Id is also Fei's "destructive" personality. Fei has disassociative personality disorder - NOT schitzophrenia.  He has 4 "personalities": the Fei we know in the game, Id, Fei the coward, and Fei the "fake" persona. (By the way, Id isn't to be confused with Id, the primary part of the mind or whatever).

The cause of Fei's disorder was, for lack of better words, childhood trauma. Fei's mother Karen had become the host body for Miang. When Fei was 4, Karen/Miang discovered the Fei was a 'contact' - part of the Wave Existence. (Deus was the other part)  Mom took Fei to labs where all these tests and experiments were done to him, and these tests became really unbearable, and leaving Fei wondering why Mom wouldn't help him. Fei tried to tell Dad what was going on, buit he just assumed it was a child's runaway imagination. Most of the time, his father was busy with his duties in Shevat, and didn't notice Karen had changed. Fei's mind, or subconsciousness created another "personality" to deal with this trauma. This, of course, is Id. Fei, the coward, pushed all the bad memories onto Id, making Id's hate grow to extreme destructive rage.   Grahf is Lacan.  He came to the village because he wanted to return to the perfect re-incarnation of Lacan's body - Fei.  (Lacan was split up into two in Grahf and Fei - his spirit in one and his will in the other.  This is why Grahf wanted to "become one" with Fei.  He fought Khan, and Karen died standing there, from a shot by Grahf. Remember the early flashbacks of a young Fei splattered with blood? While Fei was targeted, Karen's humanity finally overpowered Miang even just for a few seconds, moving in front of Fei to save him, and killing herself - her blood all over Fei. However, Id blames Karen's death on Fei, the coward.  Id does not have the memory of mother saving him.  Id also blames Khan, for not being around for him and his mother.

The Fei we know has no memories of his past at all before his life in Lahan. Id remembers only all the bad memories, making him so angry and self-destructive. Fei the 'coward' holds all the good memories, being a coward because of refusing to remember the bad crap. Id is only conscious when Fei sleeps. Id created Redrum, the Kislev sewers monster, which is why Fei had nightmares at the same time of the murders (which were all at night). Id can destroy villages and fight Gears all on foot (although he had his wicked looking red Gear...) The first time you fight Id and return to the Yggdrasil, that is why Fei is not in the medical room, but by Weltall in the Gear hangar.  With all the strength of Id, still Fei the 'coward' seems to have had more control. The Fei we know, however, has no clue of any of this until Citan tells him.

Shevat feared Fei because of Id's destructive power. Grahf caused the incident in Lahan to try and awaken Id (which, I believe he did). Citan, for Solaris, keeps watch over Fei to make sure he doesn't become a threat... or that Id does not awaken; and also because Fei's a real Contact. Unfortunately, Citan can't stop Id from 'awakening'. If Fei lives as peacefully as he did in Lahan, Id can be kept away.  It is why Fei hates to fight.  But if Fei's disturbed by disaster or fierce battling or such, Id will awaken.

All this info, I'm sure isn't totally accurate; I've only played Xenogears through once and I don't remember everything too well. But I tried =)