after fighting a few of them.. Akali and Irelia aren't bad
Don't stand in their death zones and you'll be fine
Irelia is definitely the stronger of the two by a mile, but akali is actually pretty cutthroat for the akali player, if you have any experience with mechanical skill champs she's dead.
Irelia is more about prediction, akali is basically "Uhh imma walk out of the smoke and then just all in her when it's down"