There's not enough information to say exactly who Kathy is. She could be an ordinary person with an interesting life story, or she might be someone known in a specific community or field.
Chen Kaixi was an assistant director. His representative works included the short film, The Clock That Was Two Minutes Slow. In addition, Chen Kaixi also played a role in the TV series Dear Enemy, played by Chen Yanxi. There was no other information or background information about Chen Kaixi.
Well, it depends on what you mean by 'real'. If you're asking if it's based on actual events, then it's a fictionalized account with some elements inspired by real life.
It's a bit of a mix. The story likely takes inspiration from real-life elements but adds creative elements to make it more engaging. So, it's not purely true or false.
I don't have enough information to say exactly who Cap'n Kathy is. She could be an original character created by the fan fiction writer. Maybe she's a pirate - the 'cap'n' part could suggest that - who has some connection to the wizarding world of Harry Potter.
Kathy Andrews could be an ordinary person around whom some interesting stories are woven. Maybe she's a character in a local folklore or a self - published collection of stories. Without reading the actual stories, it's difficult to say more about her.