Nonononn is a fugitive witch and Sweetland's most wanted criminal, having been framed for mass murder by Queen Purilun, her former best friend and fellow magical girl contestant. This betrayal during their shared journey to become magical girls established the central conflict driving her renegade status. She originates from Sea Heaven, the same realm as protagonist Padudu.

Her constant companion is a hammerhead shark, a core part of her identity though rarely seen. She operates as a silent wanderer, sometimes emerging to protect Padudu and her companions from Purilun's forces while simultaneously evading capture herself. This protective role persists despite her primary focus on survival and evasion.

Nonononn once resided in Japan during the 1960s with a middle-class family, demonstrating prior travel between dimensions. Despite this temporal displacement, her appearance shows minimal physical aging compared to decades earlier, suggesting either slower aging processes in her native realm or differential time passage between dimensions.

Her background includes offering cautionary tales to Padudu about Purilun's treachery and the inherent dangers of the magical girl competition, drawn from her own bitter experience of betrayal. However, her specific activities between the framing and current events remain elusive. Her core motivations and fugitive status remain unchanged throughout her appearances.

Law enforcement officers Mustard and Ketchup persistently pursue her across multiple episodes, reinforcing her perpetual existence on the run.