You've pretty much touched on all the things I was really worried about most with them. I appreciate your kind words about Mokona and everyone else.
I don't think I really intended Touya to come off so grumpy (I think part of this is icon fail haha), but he definitely did, so I'm going to sit back and be a bit more careful about that. I'm definitely still trying to get a handle on the best approach with his character (without implementing TOO much CCS!Touya into him), so this is really, really helpful.
As for Kuro, yeah.. that's something I've been trying to work on. I've kind of caught myself doing that a few times and haven't really completely shaken that. I'm still looking for the appropriate balance between calm!Kuro and not having a personality. The situation with H!Fay was one that worried me a bit. I kind of played the reaction as more a "wtf WHY >_>" with the nicknames rather than ignoring them completely... even though I obviously probably should have? I'll definitely keep working to find that balance. And you know. Tag with him more. I've wanted to, I just am made of fail? IDK.