Kovu is the deuteragonist of "The Lion King II: Simba's Pride". Although he is a hero he was once a villain. In Swahili, Kovu means "Scar".
The Lion King II:Simba's Pride
He is first seen playing with the film's protagonist, Kiara, but unknown to Kiara and him Zira is watching him. After a while Kovu is taken to the outlands and Kiara is sent to the Pridelands. After Nuka is scolded for not watching him Kovu instantly takes the blame and over the years Zira trains Kovu to kill Simba for the death of Scar. The plan is for Kovu to rescue Kiara, for Kovu to be welcomed into the Pride Lands and when he gains Simba's trust he will kill him. It goes well but Simba doesn't trust him and Kiara falls in love with him so Zira and the Outsiders attack Simba and Kovu and whilst Kovu refuses to kill Simba, Nuka does it instead, but trips, gets logs thrown at him, gets crushed by them and dies and for the first time Zira turns on the killer she had trained and causes a scar on his eye.