Yuki can certainly be proactive. She 'asks' Kyon to meet her in the park. In episode 2 of series 2 she indicates she wants something (it turns out to be an Obon festival mask but its an obvious request even though she doesn't verbalize it, she merely looks then points in a direction).<br/><br/>Also in ep.2 of series.2 she verbally declines an offer made by Haruhi, so yes, she can form opinions and such, though she is still minimalist in her communications.<br/><br/>In the final episode of series.1 where she is typing to Kyon via the clubroom computer I get a distinct emotion there. Also there is the time he takes her to the library - to me she is clearly 'delighted' at this.<br/><br/>I cannot recall the other episode specifically but it might be after she saves Kyon from Asakura, but at the end of one episode, Kyon is talking to Yuki in the clubroom with no-one else around and she makes a tiny gesture (I think its to do with her glasses) and I just get this small feeling of attraction there from her towards Kyon.<br/><br/>At the end of 'One Day in the Rain' Kyon wakes up in the clubroom and he has two girl's sweaters draped over his shoulders to keep him warm. Its obvious that both Haruhi and Yuki have put their clothes over him in a protective and friendly gesture.<br/><br/>Remember also Kyon is, what? A Sixteen or seventeen year old boy, in a club with three very cute girls. I think at various times he has feelings towards all of them. I don't know if he can help it, its a hormonal thing.