Babu is a young lion cub who only appears in the book, Vulture Shock.
It is mostly agreed that Babu is the little cub rolling on the ground in the illustration. So, Babu is a sandy-colored cub with a tuft of darker brown fur on the end of her tail.
Babu's personality is unknown. We know she likes to giggle.
When Kopa, Simba's son, is asking Leo about "his family tree", she asks if it has any leaves or fruit on it. Babu giggles at this, obviously amused at Kopa's confusion. This is the only time she's seen in Vulture Shock.