One popular theme is the exploration of the characters' mental states in more depth. Since Omori has such complex characters dealing with psychological issues, fanfics often delve into how they might overcome or further struggle with their inner demons. Another theme is alternative universes. Writers create different scenarios where the events of the game could have taken a different turn, like what if a certain character made a different choice at a crucial moment. Friendship is also a big theme, showing how the characters' relationships could develop in new and interesting ways outside of the main storyline.
Despair is a very common theme. In these fanfics, the characters often face hopeless situations, much like in the bad ending of the original. Another theme is loss, whether it's the loss of a loved one or the loss of one's own sanity.
Sunny is a very interesting character to write about. His complex past and his struggle with guilt and mental health issues provide a lot of material. You can explore how he might interact with other characters differently as he continues to heal or regress. Aubrey is also great. Her tough - girl exterior but with a vulnerable side underneath gives room for exploring her character development, especially in relation to her friendships and past experiences.
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.