Apparently in these Emiri & Ryoko act more like guardians/trainers to Yuki.
I like this one because it's howlights how she's the popular class rep and she's the girl stuck in the corner. What's up with that anyway? (if Yuki was senior)
A fan theory (do remember that that's all it is, there's no real proof of this) is that Asakura was originally supposed to be the interface that would interact with Haruhi the most. But Haruhi stumbled upon the Literature Club and since Yuki was there, she just got in by default.