Kako is Oobi's outgoing and overconfident best friend, who fancies himself a talented musician and artist. He is clever, dependable, and goofy. However, Kako is shown to get frustrated easily if things don't go his way. When this happens, he can always count on Oobi and Uma to help him overcome his problems. He thinks that Oobi is the most "perfecto" friend he could ever have.
Kako lives across the street from Oobi in a red brick house. He lives with his parents, Mamu and Papu, and his pet Shih Tzu puppy. Kako's mom spends most of her time working at a big office, but she still finds time to spend with her husband and son. Kako knows that it's important for his mom to work, but he can't help but miss her when she is away.
Kako likes to use Spanish phrases. His catchphrase is "Perfecto," usually followed by him saying "Mwah!" and kissing the air. He also uses nada (nothing) and adiós (goodbye) throughout the show.
Out of the four main puppets, Kako's character and voice stayed the most consistent from the early development to the later episodes. The only real change between the shorts and the long-form episodes was giving Kako a red hat to distinguish him from Oobi. In the shorts, he looked almost identical to Oobi, aside from his skin tone.
In the earlier episodes, Kako was almost always at Oobi's house, and his own family was very rarely mentioned. In season three, Kako's parents Mamu and Papu were shown on screen for the first time. The episode "Kako Dinner!" served as a way to introduce Kako's parents as secondary characters. In the episode, Oobi has dinner at Kako's house for the first time and learns that Kako's family customs are very different from his own.
In a 2016 interview, Noel MacNeal described his experience on the show:
Kako is a dark-skinned hand puppet. He is about the same height as Oobi. In the shorts (season one) and season two, he has green-blue eyes. In the third season, his eyes are a lighter green.
In the shorts, Kako has no accessories. In the long-form episodes, he almost always wears a red knit cap. When he plays T-ball, he wears a shiny red helmet instead of his usual cap.