Mbuni's flock is first seen during the mudslide. With a large pile of mud sliding towards them increasing velocity, they panic and run around in circles while Simba and the Lion Guard save their eggs from falling off a steep cliff. Although it was a struggle, they manage to save all of the eggs from falling. With the eggs safe, Mbuni and her flock finally calm down. She approaches Simba and thanks him for his deed, telling him she feels honored to have the king of the Pride Lands save her eggs. She and her flock then bow to the King.
Later, Swala and her herd stampede across the Pride Lands. Once again, Mbuni and her flock scream and run around in circles. Fuli runs ahead to calm them down while Ono calms Swala's herd. Ono advises Fuli to be 'soft and soothing' while speaking to the ostriches, to help calm them down. When she gets there, she tries to speak soft and soothing as instructed. When it doesn't work out, she screams at them and they calm down right away.
Mbuni is the the leader of the flock. She is an ostrich with black and white
feathers, a long, pale pinkish white neck, and dull grayish pink legs. She has large, round blue (and sometimes brown) eyes. She is quick to take advice despite how poor it may seem, and has confessed to being afraid of hyenas.