Nyuni has a yellow plumage on his front, which wraps up into a swirly pattern on his face. His back is comprised of light brown feathers, as are the feathers closest to his head. His feathers then turn white and are tipped with black. His tail feathers are also black, as are his talons and beak. His eyes are brown.
Nyuni is a keen traveler, and enjoys seeing as much of the Pride Lands as possible. He is amicable, yet he can be moved to irritation when others disrupt him. Despite a hint of sarcasm also present in his personality, Nyuni is overall a helpful fellow who does not hold a grudge.
As the Lion Guard attempts to free Bupu from a branch, they accidentally disrupt Nyuni, who irritably protests.
Beshte greets him, and Nyuni explains his reason for being in the tree. Kion asks him to find a new nest, but Nyuni refuses. Zazu soon approaches, and decides the situation needed to be in his Morning Report to King Simba.
Amind Bupu's protests, Kion gets an idea, and the branch that Bupu's horns are entangled in, which also contains Nyuni's nest, is broken off.
Bupu is skeptical, but Nyuni accepts the decision, and Bupu leads the herd away.
Later, as the Guard questions Bupu, Nyuni informs him that Boboka's son had wandered off. Bupu thanks him, and leaves to deal with it, halted when Fuli states her disbelief of them being able to get along.