Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
With this build I've gone 26/0/6, 22/0/11 , 13/0/14
I really enjoy going mid with Akali, however even laning with a partner you can still do pretty well. Early game mid is focused on last hit on minions up to lvl 6. After level 6 i dash at an enemy, throw down the cloud, use mark of the assassin and crescent slash, then run back into the cloud. After about two times of this combo you can ignite and get the kill. The only character that stopped me from killing them mid was chogath.
After that I help gank a lane, might get another kill and go back to base.
Mid game depends on if team fights are going on yet or if you might be able to help another lane. And continue laning mid. During team fights you can harass by dashing at enemies and throwing a shroud down, or picking off enemies of low health. You can turret dive fairly easily by dashing, using mark of the assassin, and ignite then flash back.
Late game with stacks and the item build up to zahona's ring and trinity force your pretty unstopable in one on one fights. If you ever find yourself out of position toss a shroud down and dash at minions or run another way. Also keep in mind that if you are stunned or focused zahona's passive comes in handy from time to time.