I don't know what KHR is...
To be honest, not that my opinion matters much mind you, or that my tastes generally match mainstream. But I'm not overly sure what fandoms are actually generating enough fan fiction to warrant their own sections these days... practically every series in the last 5-7 years I've bothered to pay attention to for fan fiction has stalled or otherwise not become the hit post series I expected it too... Sekirei, Haruhi Suzimiya, Index/Railgun, Fate Stay Night, Zero No Tsukaima, History's Strongest Disciple Kenichi, Log Horizon, The Marksman and Vanadis, GATE, Hidan no Aria, Demon King Damio, etc...
Going back even further, that trend continues, Read or Die, Full Metal Panic, Black Lagoon, Garden of Sinners, You're Under Arrest, Yami to Boushi to Hon no Tabibito.
About the only ones to come to mind is maybe RWBY and maybe High School DxD, but I do not read much of either of those that are not crossovers.