Kate is one of my favorites' too. Also Lynx. My absolute favorite is Rei though, best waifu.
Personally I hope to see a hot three way with MC, Rei and Kate. Or maybe MC watching Rei use a strap-on with Kate, or Hannah or Lynx. But that's just me.
Im not a fan of Amanda, Lishia, Jennaka or Vellany though. I'm actually thinking of restarting yet again and doing a more selective Harem. Get Amanda and Jennaka out of the Harem at least and probably Lishia and Vellany too.