Diana minor changes
Diana is my favorite champion in the game but since the new assasin rework I can't find any reason to play her. The main concept of the rework was to give assasins less of a linear (go in kill, hopefully don't die) to a pick your targets carefully and whittle down the enemy team playstyle, and honestly I feel like Diana suffers from this linear playstyle a lot and the boosts to other assasins makes her unviable.
Mainly I feel her problem is conflicting abilities/roles and a lack of an escape/outplay/break away factor. For her passive it's a 3rd hit proc'd ability, yet your health and attack speed coupled with the fact that your main damaging abilities are burst oriented means that you will die in most fights before getting off three strikes. The E is IMHO unaligned with the rest of her kit I have an insanely high sticking potential with her ult alone I don't really need anymore. Lastly I feel as though the moonlight concept is just under utilized; I could appreciate a high risk high reward champion but in the current meta Diana is just outclassed.
What I would propose is simply to change her first to an assasin not a fighter then her passive and E because the rest of her kit I feel is really well developed as a squishy target deleter. First for her misdirected passive just change it to something along the lines of gangplank with her existing concept (increased damage AOE crescent in front of her) after some interval of time her passive is up and she strikes in an arc dealing increased damage. This I believe would give it both more viability and require the player to decide whether to jump in without it or wait for the increase in burst. Secondly her E instead of a pull make it to where Diana pushes all targets not affected with moonlight away and maybe refresh her passive. This would give her a multitude of benefits from an escape mechanism to an increased ability to lockdown and execute SINGLE targets since she is a super bursty champion already an added feature to the moonlight and again increased player input in which target to attack. Overall, I feel as though these changes are very in line with their direction on assasin champions per the dev thread on the class rework and gives Diana some viability in the current meta.
Sorry for the long post ;P