I love all your characters. So much. You play SO many, it's kind of astounding. And they all have their own, unique voices and personalities, even those that could easily sound so similiar. I love that you can also take characters with relatively little canon to go off of (Syaoron, Seishirou, Tachibana... all of these are limited for different reasons but you get my point) and you can make them really shine. They seem so well-rounded and developed, and don't ever seem to fall into simple one-sided genericness.
Also, Seishirou is such a fucker. Oh my god. I know Ana and Celen have been showered with love on how they handled the most recent plot between the vampires and Sei, but I just love love love Sei in these threads. I know you shy away from fighting logs, but his fight/death with Kamui was so interesting and fun to read, that it honestly didn't seem like a struggle for you at all, just very natural. And god, poor Subaru. You know you're playing a good Sei when you're just stuck in "oh honey, no" whenever Subaru does anything. Yes. He's delightfully dickish.
Again, already said to Celen but, I loved Fay's and Tomoyo's threads, and just how Fay handled the entire de-aging thing with both Tomoyo and Kuro. I loved that you did address his issues without being over-the-top or BAWWWW-y emo, thus derailing and attention-grabbing towards him and away from adorable, broken teenies. I loved how he's grown in that respect, but still very much has issues that he needs to face. Also worth mentioning that I adore his troll-y side, too, which is making its way out more and more as he becomes more comfortable.
I also enjoy the way you've had Riku handle the entire situation with Kaza. I like that he isn't flat-out DENIAL about it, but still very much has issues relating to those feeilngs, and I think you handle it nicely (while still broing it up with Koryuu, etc). I think it adds an interesting layer to his personality.
... Again, already mentioned to Celen (gotta stop doing that), but I love Kokuyou's threads with Hisui. I think that you've done a nice job following the advice of last meme, having him post with something that relates to Hisui, so that her CR would have an easier time of talking with him. But I love how ridiculously SAPPY this guy is (hence the username, I'm sure). Because you wouldn't expect such a tall, dark dude to be so utterly dorky when it comes to his angel. But it never fails to crack me up and you handle it so perfectly.
Not to say your other characters aren't fantastic, but those are the things that really stand out to me. I don't have any crit to offer at this time, just the general encouragement that your characters are so much FUN and I love stalking and playing with them.