I posted my con Fai/Chii post in the chapter discussion section since, well I just needed somewhere to vent it! Subsiquently, it was off topic! So I'm going to be really boring and just cut and paste my rant to this topic because, dammit, I want that cheesecake!
Thinking logically, the FaixChii pairing makes very little canon sense to me. No canon sense at all infact.
As many people have said, CLAMP have established the rule that, even though characters belonging to different worlds may act differently because of growing up in a different environment, their heart/soul remains the same. Now why on earth would CLAMP contradict their own rule by pairing Chii with Fai? Chii, as we all know, has already found her one-and-only soulmate: her "Special someone just for her", and that soulmate is Hideki. Pure and simple. Nothing more to it. She spent 8 graphic novels looking for him for crying out loud!
If CLAMP liked the way Chii and Fai looked together I have no doubt that they would have used Chii's poor, loveless twin Freya instead. Thinking logically, would they really trample all over their Chobits series for a pairing that could so easily be substituted?
That would make absolutely no sense!
Have we had an example yet of a CLAMP character that has a soulmate in one of their previous manga series and has turned up head over heels with someone else in Tsubasa?
No.
Touya is still with Yukito, Sorata still loves Arashi, Syaoran still loves Sakura (and vice versa), Ashura still loves Yasha, Yuzuriha still has a deep connection Kusanagi. The list goes on.
Now, I think someone has mentioned that these rules do not apply to unrequited love in the CLAMPverse.
In Rayearth Primera had an unrequited love for Lantis, but in Tsubasa, it seems she has found a soulmate in Shougo.
With all these facts in mind, the best the Fai/Chii shippers can hope for in Tsubasa is a one sided love. Fai could love Chii and the love not be returned, or Chii could love Fai and the love not be returned. But of course, by just reading Fai and Chii's conversation we can see how unlikely it is for either of those options to be true!
When Fai told Chii that he was leaving, was she upset? No, not at all. Just a little confused with that adorable Chii-like innocence. Can you imagine her reaction if Hideki told her he was going to leave her? In Chobits, even before she realised she loved him, she was reduced to tears at the thought of being parted with him.
Why exactly Chii was created we have still to find out. But Fai certainly didn't seem at all cut up about leaving her behind. A quick cuddle, a few "Good Chii! Good Chii!"s as if she was a some kind of pet and off he went, not seeming bothered that he'd left her dangling in net form above the man that would be after his blood once he woke up!!
We have to conclude that 1) For some reason Ashura is no threat to Chii, even when he is awake, or 2) Fai has little regard for Chii's wellbeing and cares more about his own safety. (Which seems very Fai-like to me)
Fai has a great deal of magical power. If he truly loved Chii he would have brought (or at least tried to bring) her with him. If Yukito can transport two people to another dimension, why not Fai too? But no, Fai was as flippant as could be about leaving Chii as she obviously serves the purpose of an alarm system for him where she is.
It was only as he looked down at Ashura in the pool that he had that look of turmoil and regret on his face. A sorrow and fear that Fai has carried with him all through the TRC adventures. He's constantly thinking back Ashura. He's never once thought back to Chii.
Why are they so touchy feely then? The answer is obvious! Both of them love the physical contact with people. In Chobits, Chii loved to cuddle, touch and fling herself with innocent intent at the people she liked as friends. She hurled herself into Manager Uda's lap after he gave her a job at his bakery.
Fai has flung his arms around loads of people in Tsubasa! Both Fai and Chii are just very touchy feely characters. A fact that embarrasses Hideki, and frustrates Kurogane no end!!