Black Bananya is one of the many tiny cat creatures who reside inside banana peels, living covertly within a human household and emerging only when people are not present. As his name suggests, his most distinguishing physical feature is his black fur, which sets him apart visually from the other characters. He is also consistently depicted wearing a small, neat red bowtie, which gives him a dapper and stylish appearance. In some sources, he is identified as a stylish gentleman originally from France.

In terms of personality, Black Bananya is portrayed as a sophisticated and cool character. The addition of the bowtie is a key visual cue that reinforces this image of a well-dressed and composed individual. His black coloration also plays a practical role in his interactions with the world, as it makes him virtually invisible in the dark.

Regarding his role in the story, Black Bananya is a member of the main group of bananyas that live together. He is introduced early in the series, appearing alongside other core characters like the main Bananya, Tabby Bananya, and Bananyako. One notable episode highlights his ability to blend into the shadows. In the seventh episode, the other bananyas become frightened by a mysterious shadow lurking at night, only to discover that the source of their fear is simply Black Bananya, whose dark form cannot be seen clearly in the low light. This moment underscores how his unique appearance directly influences the plot of an episode.

There is no available information regarding his specific motivations, his key relationships with other characters, any character development he undergoes throughout the series, or any other notable abilities beyond his natural camouflage in darkness.