Lore: In a past life, Kerrigan was a ghost working for the Confederacy under Emperor Mengsk. After her abandonment on New Gettysburg, she is consumed by the Overmind and transformed into the Queen of Blades. Purposed with aiding the Overmind to avert the extinction of the Zerg, she rises through the Zerg Heirarchy to lead them against an uncertain future.
A "ranged bruiser" with an int build option, Kerrigan should take mid or short lane and focus on getting every creep kill she can with her amazing laning phase. She is slow and cumbersome, so positioning in teamfights is absolutely key. In later fights, spam ult for vision and poke. Max E first for the insane dot in laning. Note that her W Bounces do not proc any item effects except crit/lifesteal/her E. Run 1/3/2 talents, taking weapon damage, health, armor, both movespeed, and finally youth.