I voted Kiara.
I think Nala is cute, but leaning more towards pretty and beautiful when trying to describe her. Simba is cute too, but I find Kiara to be the cutest of all the cubs.
Kiara is adorable, I`ve always found her to be a very cute cub. Kovu is very cute as well, and Vitani is too tough to cute. I like her design, but don`t think of her as "cute."
And Nuka scores 0 points on the cuteness scale.