Babu Lisa is a classmate of Naoko Watanabe, consistently portrayed with medium-length brown hair and black eyes. She always wears a one-piece baby outfit and keeps a yellow pacifier in her mouth, moving it to her head while eating or drinking. Her personality combines snarky mischief with a sharp financial acumen, particularly concerning stock market investments. During the "Picnic" episode, she expresses panic over lost cellular service, fearing potential stock losses amounting to millions. In "Gau-Croquette," her tantrum over delayed croquettes results in Toshio serving her and Halley from an older batch instead of fresh ones. She operates the "Babu Channel," a fictional video platform with over 10,000 subscribers. Despite her infantile presentation, she possesses intelligence equivalent to a typical middle school student. Her original Japanese speech appends "Babu" to every sentence, though English dubs omit this trait and Spanish dubs replace it with non-lexical sounds. Visual cues distinguish her moods: sparkly eyes signal a "sweet" demeanor, while mean-looking eyes indicate a "naughty" state.