Who counters diana now

Long range poke mages and cc heavy mages.

Pretty much everyone before 6 if they're competent

That's the thing with her, and this is a Diana main talking, Diana doesn't really have any hard counters, nor does she truly counter anyone else. :/

This is what makes her such a safe pick! Her power is very much determined by player skill. If you can't land your Q b/c of dodging or just missing, Your combo just lost a lot of Umph! :P

I guess the best answer to your question would be and , as they have given me the toughest lanes in the hands of good players. Yasuo's passive and W make doing permanent damage a nightmare! Zed out ranges you with most everything he does at comparable damage. In both cases, they are mana-less compared to the rather thirsty Moon Princess, so you'll often be forced out of lane before them w/o jungle help.

Lastly, In this tank heavy meta, She can feel pretty underwhelming in the late game, particularly if the enemy team won't split up.

This is the best advice I can give against my beloved Luna! Hope she destroys you! :P

Malzahar, Akali until lvl 8-11, Yasou until lvl 6-11, Chogath (snowball matchup), Cassio & Azir (skill matchup)

Cho'gath.

with and does REALLY well.... additionally lissandra can help ganks against diana really well, so it's easy to camp diana into the floor