Koko is a parrot who is a prominent supporting character in the anime and manga series Jungle Emperor Leo. He is introduced as a childhood friend and lifelong loyal companion to the white lion Leo, remaining a steadfast presence throughout the many events of the story. Koko is portrayed as a talkative and somewhat boastful figure who frequently claims to possess vast knowledge about the jungle and the wider world. In practice, he is often scatterbrained, clumsy, and prone to comedic mistakes, which makes him a consistent source of humor. His lively arguments and banter with the deer Tommy form a recurring comedic duo, with the two playfully bickering while supporting their friend Leo. Despite his comic tendencies, Koko is deeply good-natured and genuinely brave when his friends are in danger. His primary motivation is his unwavering loyalty to Leo and his dedication to the ideals of peace, cooperation, and mutual understanding among all animals. Within the story, Koko serves as a messenger, a scout, and a trusted advisor who is always ready to help. He is given significant character development when Leo entrusts him with the important honor of naming his newborn cubs, a duty Koko takes seriously, deriving their names from the Japanese words for sleep and wake. Koko possesses a notable ability to perfectly mimic sounds and voices, including the voices of humans and other animals. He uses this talent creatively to support Leo, once successfully impersonating the voice of Leo's deceased father, the former jungle emperor Panja, to spur Leo into action or offer guidance. He also shares Leo’s ability to understand and partially speak human language, allowing him to act as a bridge between the animal kingdom and the human characters who enter their world.