I honestly have no critique to give about Ty Lee because for what I've seen of her, you're doing really well at capturing her voice. I think at times it was a little clear you were distracted about rping, which isn't a reflection on characterization or anything like that, but rather an indication that you needed a break.
I think you're doing a good job of capturing Yuuki's personality, especially in lieu of Kaname leaving. You do a great job of highlighting her sadness and her reaction to the loss, without making her TOO closed-off and distant from others. You can see that she's sad, and maybe wants to isolate herself, but I'm always happy to see her tagging around.
This isn't so much a comment on activity or characterization as it is with tagging style. I've noticed lately that when it comes to logs, you seem to only ever post top comments, but don't tag around. Sometimes it seems a little discouraging and comes across as, well, maybe she doesn't want to tag my character so I shouldn't bother her. I've found that it helps my activity to lay off on top comments and instead tag around more, because it puts the control more in my hands (determining who I will tag and how often I will tag, versus being at the mercy of whoever it is that will come my way). So maybe when trying to get your feet back from under you, perhaps focus primarily on tagging others instead of just a top comment? I don't know if that's a method that you like to incorporate, but I know that for others in the past, such a method has helped get back on their feet and get activity back on track.