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.
Well, it could be about the female characters in Harry Potter getting involved in some sort of slime - related magical expansion. Maybe it's a creative take on how they use slime in a magical way, like in potions or charms. But without reading it, it's hard to be sure.
The central character is Omori. Alongside him, Aubrey is an important character. She has her own personality and role in the story. Kel is another friend, always bringing some energy and a bit of naivete to the group. And Hero, he is also one of the main characters, with his own story arcs and relationships within the Omori story.