@takashichea: Yeah, she should have a page. Software or not, she is clearly sentient and self-aware. I would leave the honorific in her name though, it helps define her and seems to be treated as part of her actual name.
This series is becoming a platonic harem since we know Nanami is all antsy around Sorata, and Shiina, she has an interest in Sorata. Unlike Nanami, she is less subtle. In episode 7, Yuko arrives, and man, she loves her big bro. I mean her wish was to get spoiled by Sorata.
I'm not really sure what you mean by "platonic harem" since platonic love means non-sexual love and a harem in anime is typically a group of characters who are all sexually attracted to one other character. Seems like a contradiction to me.
Nanami and Shiina are both clearly attracted to Sorata, though Nanami understands that but Shiina is confused by her feelings. Yuko at least thinks she's "in love" with her brother but that's just a typical little sister archetype. I doubt she's genuinely attracted to him in any kind of sexual way, she just loves her big bother a lot.
I don't want to spoil anything for you so you need to catch up :P