"'Does it have leaves?' he asks. 'Or fruit?'"
Babu's appearance is unknown. However, as s/he laughs most uproariously at Kopa, it can be assumed that s/he is the laughing lion pictured at the top of the page.
Not much is known about Babu, except that s/he is playful and teasing.
When Kopa asks Leo about his family tree, he asks whether it has any leaves or fruit on it. After the cub runs off to find his father, Babu giggles and teasingly echoes Kopa's question.
- Babu is most likely male, since his/her name has a masculine meaning.