lilia is for most of u guys not S+ tier but since heca is nerfed and udyr aswell a bit lilia is really good with ad mid champs. (not recommended for low elo)
rumble nocturne is almost always good vs immobile targets and those 2 champions seem quite op in soloq
i would put diana in A tier but i couldn't find the icon.
K6 specifically in soloq is S tier since u just murder people if you play him right.
fiddlesticks is S tier or even S+ tier if you have full ad champs and they cant go mercs