Maximum assassination kill threat and snowballing damage.
Burst damage and target access
Hitting a champion with 3 separate attacks or abilities in 2s deals bonus adaptive damage.
Gain a burst of Lethality and Magic Penetration after using a dash, leap, blink, teleport, or on leaving stealth.
Collect eyeballs for champion and ward takedowns. Gain permanent AD or AP, Adaptive for each eyeball plus bonus upon collection completion.
Unique takedowns grant permanent cooldown on your Ultimate.
Durability and crowd control
After taking damage from an enemy champion, the next 3 spells or attacks you receive deal less damage.
Increase your Tenacity and Slow Resistance for each summoner spell on cooldown. Immediately after casting a Summoner Spell, gain a larger burst of Tenacity and Slow Resistance for a moderate duration.
+5 AD or 9 AP
+6 Armor or 8 MR (match-up)
Akali loves burst damage and she can quite easily proc Electrocute with a [Q]->Auto->[E].
Akali can make use of both the Magic Penetration and Lethality of Sudden Impact, while nearly always having the proc up with [W] and [R] casts.
Akali loves to kill and snowball. Eyeball Collect is perfect for bloody lanes/games where you're looking to run away with a lead.
Akali's new [R] has insane kill potential thanks to its high damage, but that comes at the cost of a long cooldown. Ultimate Hunter helps give you more opportunities to kill and carry any game.
Bone Plating's early game damage mitigation help you through the early laning phase so that when you hit 6 you're not too far behind and can find kill pressure.
The hardest counter to Akali is CCing her while she is out of [W] invisibility. Unflinching helps patch up some of that weakness.