Haruhi's relationships with the rest of the brigade are really something to ponder about.
Kyon: She
obviously loves him in some way. But she plays Tsundere with him, of course. If she had a different personality, they might even be dating by now.
Mikuru: This is one to think about. Haruhi obviously thinks
something of Mikuru...
But other than that, nothing much to go on. If it wasn't for the whole "Haurhi is a jerk and she forces Mikuru into outfits" thing, and Haurhi was a bit nicer, they could be friends, considering Tsuruya is kinda like that.
Itsuki: He's second in command, she probably thinks good of him. Like Mikuru, not much to go from there. He's quite loyal to her, though, so she might trust him a bit.
Yuki: She's definitely the furthest from Yuki, so to speak. They never really talk, and there's points that Haruhi doesn't seem to know she's there. (And everyone else, for that matter
)