1. Akatsuki from Log Horizon
2. Asuna from SOA
3 ? I don't think it's Shino from .hack/Twilight, but that's as close as I get with that character...
4. Subaru .hack//sign

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#3 is Atoli from .hack G.U.

Base +7, @43883 +32

They really like to reuse avatars in .hack, I guess. Wikia states: "Atoli is almost an identical twin to Shino, due to sharing the same character Model, the only differences being her hair, and the lack of a teardrop shaped mark, along with a more colorful outfit." So I wasn't far off :) http://dothack.wikia.com/wiki/Atoli

Base +50, @43883 +32, Wing X Custom -6

DMM - http://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_078277/

Akibain - http://www.akibain.com/d5/?cls=cntdtl&cid=87809

Base +33