Well, it depends on which comic universe you're referring to. In some indie comics or specific storylines, there might have been a character named Polly Cooper. But she might not be well-known across all comic genres.
I don't have the exact name of the person who created the Omori manga at hand. It could be worth doing a search on manga databases or asking fellow manga enthusiasts for the answer.
Omori is purely fictional. The story and characters were imagined by the creators, not drawn from real-life events. It offers a fantastical and imaginative experience for players.
At the moment, there's no definite date for the Omori manga release. But you can follow the official social media accounts or manga forums for any potential news or leaks.
I'm not sure specifically which 'Polly' and what 'Nirvana' real story you are referring to. There could be many people named Polly, and 'Nirvana' can refer to the famous band or have other meanings in different contexts.