Koko is a young girl who treasures the penguin coat given to her by her late father. She clings to his promise that she could one day fly, and she often wears the coat and attempts to take flight, which leads to teasing from other children. Despite the ridicule, she remains hopeful and determined, never entirely giving up on the possibility her father spoke of. This deep-seated belief is not only about defying logic but also about maintaining a connection to him. When she follows a curious cat one night, she stumbles into a mystical realm of goblins who are under threat from the evil Buccaboo. The goblins identify her as the legendary flightless bird destined to save them, a role she initially doubts but eventually embraces out of a desire to protect her new friends and to prove that even the seemingly impossible can be achieved.

Koko’s personality is defined by her courage, compassion, and resilience. She does not let the bullies of her own world or the dangers of the goblin realm break her spirit. She forms close bonds with the goblin Chaley and the fallen angel Zammie, seeing past Zammie’s intimidating exterior to the wounded being underneath. Her empathy drives her to help Zammie reclaim his lost wing and escape Buccaboo’s influence. Her grandfather, who has silently watched over her, also plays a key role in supporting her during the final confrontation.

Throughout her adventure, Koko undergoes significant development. She moves from being a lonely, unsure child to a confident leader who inspires those around her. The emotional peak of her journey comes when she learns to truly fly, guided by the memory and spirit of her father. With his aid, she soars through the sky, confronts Buccaboo, and restores peace to the goblin world. This achievement allows her to reconcile her grief and proves that the bond with her father remains unbroken. Her most notable ability is flight, granted through faith and the love of her father, but her bravery and kindness are equally powerful tools in overcoming every obstacle she faces.