To be precise, listening to its funny quotes, its a fully cleansed Kerrigan - The one at the start of Heart wasn't fully, 100% cleansed - Thus, the zerg-like dreadlocks, the psionic control over the zerg, and the mutations she gets throughout the campaign. So its 100% human compared to 10% human. I would put it as alternate reality SC.
I would also put Prisoner Tychus as alternate reality SC, as Tychus never did escape from prison.