The following section contains information from a previous version of StarCraft II: Heart of the Swarm which is no longer valid.
By May 2011, Kerrigan had four skill sets, although not all had been developed as of then. Other potential skill sets revolved around defenses, comboing with air units, stealth and "roach-burrow supporting Kerrigan".
At some point Kerrigan's game unit appearance evolved as she progressed through the campaign.
Kerrigan's abilities were divided along the lines of "Corruption" and "Spec-Ops." These two types of abilities tapped into her zerg and ghost aspects respectively.
Corruption gave +3 armor.
Spec-Op gives +50 energy.
One of the destruction abilities gave Kerrigan the Crushing Grip ability, which stunned enemies in the area of effect for 3 seconds and inflicted 15 damage over that time.
This was an ability that allowed Kerrigan to shoot out bolts of lightning instead of using a gun.