Deal 7% more damage to low health champions. Gain AD/AP after kills or assists.
Electrocute is the go-to rune for lane assassination power and Wukong is easily able proc it with a [E]->Auto->[Q].
Sudden Impact provides you the bonus Lethality you need to execute squishy targets when jumping in with [E]. You're also able to re-proc the effect when you come out of stealth from [W].
Wukong top is all about assassination and snowballing off kills. Eyeball collection does just that, granting you more power for every kill and assist you pick up.
Because Wukong is also a natural builder of Duskblade, the ward sweeping will also help contribute to more damage.
Relentless Hunter with Ghostblade allows you to sprint at an enemy from lane or in ganks to get in range for an [E] and blow them up.
Triumph grants you some agency in teamfights where you're able to dive the back-line and pick up a kill before dying. That kill will grant you the health needed to get out safely or move onto the next target.
WhyCoup De Grace
Coup De Grace is the go-to rune for assassins and champions who are looking to kill squishies quickly.
The extra bit of damage will help you proc Triumph sooner to survive the dive.