Damn that's some fucking good art, props to the talented bastards in the farms.
Now to give my two cents as a certified animefag, the simple design used for kiwidansen or the two logos someone drew before are definitely the way to go, what everyone is doing is simply moe gijinka, so the design should be based in the forum, as kiwichan is supposed to be a cute anthropomorphized version of the forum, not specific users or even female users (as Null seems to want) but rather the site as a whole, in this sense the iterations with Chris related things are a step in the right direction too as they work as a reference to not only the most prominent lolcow (the main subject matter of the site) but the past of the site as the CWCki, the color palette being based on the "base" version of the forum is a hit too, overall for anyone genuinely interested in this just look up things like OS-tans, Kancolle, Wiki-tan and such, since those kind of set the bases a bit when it comes to online moe gijinkas, I suppose there were some early ones made in 2ch.