There is nothing you can do about Akali
Even if she is behind she can still one shot you. You can't out farm her because if you try to CS you'll lose 1/3 of your HP. You can't out sustain her because of her passive and Q. You can't trade with her because she outdamages you by hitting a Q and an auto attack. You can't engage on her because of her 8 seconds "fuck you" shroud. You can't kite her because she has 3 dashes and a small blink.
...... Ive played quite a bit of kled in my time and i feel like he is the best option to counter her mid. If you hit a kled q before she enters her "fuck you shroud" the duration is long enough that you can just pull her to stop her from doing anything. "But canadain what about her q that shit hurts and heals her" you might be saying to yourself and yes this is very true you have this thing called a W passive, try maxing that first with conqueror and see who hurts more. "oh but her 3 dashes those are scary" well my friend thats where his e comes in you can now dash through her dashes and heck its refresh rate is shorter then the refresh on her r so you should have no problem wasting 2 of her dashes right there. Thats just me tho if ur afraid to take kled mid take
. his e can cancel her dash.

and still can chunk 1/3 your health with an electrocute proc.