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Tsukasa
Let me start off by saying, I saw potential for these 2 as a couple. My views are slightly altered by this. Now then. Tsukasa starts off as something for Mimiru to do, an interest if you will. When they first encountered eachother and Tsukasa blew her off, this not only irritated her, but it also gained her attention. As they see eachother more and more, Mimiru's interest in him becomes something more. She generally cares for him, and her feelings are quite honest. Not only do we see her interest becoming Tsukasa's problems, we also see that he's growing on her. I personally believe out of all of the people Tsukasa met, Mimiru cared for him the most. She had been with him since the 'start' and she always put so much effort into doing what she could for her new friend. They had a very strong connection and a deep relationship, but it started to somewhat waver towards the end.

Bear
This one is obvious. Bear acts as the father figure for Mimiru when they're online. As with all parents, Mimiru looks up to him and goes to him for advice, but also she gets annoyed with his way of acting more mature than she is. That's just what teenagers do though, as much as they care for the adults in their life, they'll always disagree with them or rebel. Such is life. Besides those roles that they each hold, it's obvious they are very close and they look out for eachother.

BT
Ah.. what to say about these two. Mimiru has an obvious dislike of BT and also an obvious distrust, with good reason of course. While these two have a lot of tension between them, because of the fact they were around eachother for a decent amount of time, and they did work together every so often, I believe that they have to care for eachother a tiny bit. If one had ended up in the same situation as Tsukasa, I'd bet money the other would help out, and not for completely selfish reasons. Still though, Mimiru sees BT as a trader and BT sees Mimiru as a little girl.

Sora
I couldn't quite say what Sora thinks of Mimiru, or anyone for that matter, he's just.. NUTS. >D Though, anyone can see that Mimiru doesn't like being anywhere near him if she can help it. Of course, they end up working together quite a lot, much to her discontent. I personally think Sora is so wierd that he's just plain neat, but Mimiru finds him more annoying and creepy. Not much else to say here.

Subaru
Putting my personal feelings for Subaru aside.. >_o I think they have a general understanding and bond with eachother. Towards the beginning, Mimiru had respect for Subaru and looked to her for help with Tsukasa. As things progress, they work together a lot more, and both are quite engrossed in Tsukasa and his problems. They're in the same boat, so they know how the other would feel. You only see a few instances between the two that would suggest they were close friends, but from those you can guess that they had an understanding of eachother and cared about the other's well being.

Ginkan
For most of the series these two don't interact much. Ginkan thinks she shouldn't even address him, because she has no reason to. He's so engrossed with his duty that he doesn't care about much else. Of course, when Subaru puts an end to the Scarlet Knights, he becomes no better than anyone else, and even ends up working with the others. This is where we see some interaction between Mimiru and himself. She tells him that because of the way he talks and acts it makes him appear to be old, and he kind of plays around asking her how he should talk. It was actually a cute scene. Maybe I'll become a Ginkan/Mimiru fan.. mwahaha.