Akali is a fun, high mobility, high skill cap AP assassin that (when ahead) can single-handedly carry games with ease. She also provides endless amounts of fun due to her almost infinite skill ceiling leaving you with a lot to learn and do with this champ

Pros:
Builds AP so unlike AD assassins she does not fall off as hard (but still falls off)
Does a lot of damage.
Versatile in her build and playstyle. So you can play and build her to duel or assassinate depending what you need.
Ungankable if played correctly due to shroud
Fun

Cons:
She is still an assassin so she does fall of late game.
Punished easily in the early game
Very squishy
Heavy cc teams shut you down