Don't really have anything to say about Chika, only because I haven't seen him around (a- although your comment about your activity means you're aware of it, at least. He has been showing up very recently in threads, though, which is good and encouraging so I hope it keeps up!). From what I have seen, he's perfectly adorable. Just hope to see more of him in the future!
Fay's so great. I loved his threads with Kuro and I'll be interested in seenig his reaction to Kuro being gone now. I think you do a good job of handling his angst and more serious side without making it overwhelmingly emo. His thread in Yuuy's post, short as it is at this time, seems encouraging. It's clear from comments like that that you manage to not make him a one-trick pony of trollish porportions. He's well-rounded and interesting and I think you do great justice to all sides of his personality. Also, your headcanon for him is just so brilliant and wonderful, I love hearing it and seeing it pop up in his conversationsa nd actions.