A lion raised in exiled lands by his mother, Zira, and the exiled lions. During his while childhood, he was trained to later defeat Simba, and gain possession of the Pride Rock. However, he learns about life and "fun", and especially "love" thanks to Kiara, Simba's daughter, and ends up giving up on the plan his mother planned all this time. Ends up having a baby with Kiara, and being trully accepted in the lion lands by Simba.
Kovu ressembles Scar, only younger, no?