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Vitani is voiced first by Lacey Chabert and Chrysta Macalush and then by Jennifer Lien. She's the only daughter of Zira and Scar and she's the sister of Nuka and the half-sister of Kovu.
She, like Zira, Nuka, and the other Outsiders, want Kovu to kill Simba so they can overthrow the Pridelanders. After Nuka dies, Vitani continues to go through with Zira's plan – until Kovu sides with Kiara and Simba and Nala. Then Kiara sympathizes with the Outsiders, and when Vitani realizes this, she no longer wants to be part of her mother's plan.
What I like is that when she realized right from wrong, she chose to do the right thing instead of doing the wrong thing anymore, and she thus redeemed herself.