Lumba-Lumba is a pink dolphin with purple eyes, lighter underside, and small patches. Like every dolphin she has fins and a nose hole through which she breathes when she is out of water. She also sprays water out of this occassionally.
When the Lion Guard comes to the ocean, Bunga falls in and Lumba- Lumba saves him. Beshte introduces himself and Lumba-Lumba says she never met a "Beshte" before. Soon they become friends with Lumba-Lumba. She says that the ocean is her home. She teaches the Guard all about the Dolphin Way. Beshte says goodbye and the Guard heads off on their journey.
Later when Kion uses the Roar of the Elders against the Komodo dragons, Lumba-Lumba ends up on the shore. Kion tries to think of a way to get her back into the ocean. He can't think straight because of his scar bothering him. Fuli soon thinks of an idea of digging a trench. However Ora and his bank of Komodo dragons come back and try to eat Lumba-Lumba. The Lion Guard tries to stop them when Ono and Anga drops seaweed on them. They also use the seaweed to get Lumba-Lumba wet enough to survive on the shore. Kion uses his roar again, and Lumba-Lumba is back in the water. She soon says goodbye to the Lion Guard and thanks them for their help.