Nuka

That's Nuka, Kovu's older Brother and Zira's Son from "The Lion King 2: Simba's Bride". 

"The Lion King 2: Simba's Pride" was a Sequel 

to "The Lion King" 

and it was a Direct-o-Video came out
on Tuesday, October 27, 1998. 

Zira told Nuka to watch Kovu, but he didn't.
But there were no Hyenas in
"The Lion King 2: Simba's Pride", just evil Lions like Zira, Nuka, and Vitani, except Kovu, he was a good Lion.