In my collection I have Quinn, Nasus, Kha'Zix and Blitzcrank. All level 0, unplayed.
I think I remember buying Kha'Zix but not "getting" him in the practice toolso he remained unplayed. I don't ever remember getting the others though, especially Quinn who I would actually have played had I spent 6300ip/be on her. Anyone else had random champions added to their collection which they don't remember getting?