Some common ones could be arachnophobia (fear of spiders), claustrophobia (fear of enclosed spaces), and acrophobia (fear of heights). These are often used in fiction to create tension and develop characters.
To use phobias from the list of phobias for fiction effectively in a story, consider the emotional impact they can have. For instance, if a character has a severe case of arachnophobia and they encounter a giant spider in an old attic, the reader will immediately feel the character's panic. You can also use phobias to create unique settings. A story set in a treatment center for people with various phobias can be full of interesting characters and situations. Moreover, phobias can be used to build relationships. A character who helps another overcome their phobia can form a strong bond with that person in the story.
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.