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ChardenXKyoko, definitely. There's not enough pr0n love for that pairing. :cough:

I've written like, a billion drabbles for that pairing. Srsly. And the age difference is what makes it fun. o: Meaning:
Charden going all: WTFS NOT ***** AHHH!
And Kyoko: Yay, popsicles.
And then Charden's head explodes. XD Because that's what happens, always.

And Doctor/Xiao. Because it's really hot. <333 They can ...experiment on each other. XD That's what my friend's fic is based on. XD

Edit: this sounds really crappy. I shall edit in better reasons. D: BECAUSE I HAVE SOME, I SWEAR.

(SLIGHT (maybe major? at least for Charden and Kyoko's characters) SPOILERS POST VOLUME 7)highlight. :d

Charden and Kyoko have such a dynamic going on, Kyoko would follow Charden no matter what, if he'd let her, but he's really concerned for her well-being as well as the promise she made to Train. He wants her to be happy, so he leaves, because he thinks that she shouldn't be involved with Chronos any further (in the manga, at least) and therefore, she shouldn't be involved with him. And then there's ALSO the fact that he thinks he's too old for her, that she shouldn't be involved with someone like him for whatever reason.

Kyoko's got a crush on Train, sure, but that doesn't mean she doesn't have feelings for Charden, I mean, she's always with him when they're in AOTS, even when she could be hanging out with someone like Leon.

And not to mention the whole abandonment!issues deal. OMG GAH SO CUTE. And angsty, my god, the angst.

Charden/Kyoko, first of all.
What is not to love about this pairing? First of all, they're both great characters. Then, there's the fact that those two are always together. Sure, that could mean anything, but seriously? Especially after Kyoko compliments Charden's appearance. If not for Train saving Kyoko all the little Train/Kyoko shippers would be shipping Charden/Kyoko, trust me.

Xiao/Doctor.
Okay, this isn't canon in any way at all. XD; But, come on. It's hot. And, well, I can see it happening. I'm sure Xiao could find some use for Doctor and from the way Xiao used the Sweepers Alliance I think it's pretty obvious that he doesn't have any problems with using people. And Doctor obviously likes to use people. What a cute little pair, right? :D
For the record, I'm the friend writing a fic with this pairing that Syntax mentioned. XD

Sven/Eve
This pairing is ADORABLE IN SO MANY WAYS. <3 I just want to slap all those Sven/Tearju and Eve as a happy family people. Cute idea and all but not at all referenced in canon, thanks, so stop saying that. Meanwhile, Eve couldn't fawn over Sven any more than she already does and vice versa with Sven unless the two started making out (which I am totally for), sheesh.

Other pairings I approve of are: Jenos/Rinslet, Sephiria/Echidna (THIS IS ALL SYNTAX'S FAULT), Sephiria/Belze (ALL MAHOA'S FAULT ALTHOUGH YOU ALL DON'T KNOW HER), Creed/Train (mostly one-sided), Kranz/Baldor, and ummm. Leon/Shiki (please don't ask).

8D;

Leon/Shiki was a joint fault, there. You suggested it and I was like "... YES CUTE. I SUPPORT." XD;

I think Doctor/Xiao makes a lot more sense. But Sephiria/Echidna is really hot and I think we could come up with sense for it if we had to argue it. 8D;

A lot of series need a good yuri pairing, buuu.

I'm not too fond of Trainslet, myself. Rins seems taken with Jenos, yanno?

The things I absolutely hate are Train/Eve and Train/Kyoko, though. Grr. They're popular with a lot of people, but I just don't like them one bit.

my otp is trainxsaya, and leonxeve

leon and eve, train and saya or kyoko wink

I can pretty much ship just about everything in the series, by now. Excepting a few things. :coughtrainkyokocough:

*__* The Black Cat characters are so fun!