Kovu is 7 lion years, Vitani is 7 lion years, and Nuka is 10 lion years.
Zira's call for her children echoed. Kovu and Vitani walked into the cave after giving up on training, and Nuka followed, muttering something. The cave was big and dark, but they knew it well, although sometimes they could get lost if they weren't careful. When the three reached Zira, she motioned them to come closer.
Between Zira's paws was a cub. She had just given birth to her fourth child. Kovu smiled, and Vitani smiled slightly.
"So what are we going to name him, mother?" Kovu asked.
"Ukali.... meaning severity. Because he was born in such conditions." Zira replied.
The cub rolled, opened his eyes and stared. His eyes were green, just like Kovu's. Ukali's fur color was a much lighter shade of Kovu's. He purred, turned around and slept. Zira stared emotionlessly at the sleeping cub, and then quietly stood up.
"Kovu, Vitani. Come outside and train some more." Zira said, and walked outside, not looking back. Vitani and Kovu followed.
Ukali was still a cub, and he doesn't know what his destiny is. One day, everything will change.