The cap in 'A Silent Voice' manga might symbolize something related to a character's identity or a specific event. It could add to the visual storytelling.
Well, 'Densha Otoko' isn't real. It's more like a made-up tale that captured people's imaginations. The characters and events were crafted for entertainment.
I'm not sure specifically what 'Cap deage' means. It could be a very specific term, a misspelling, or something relatively unknown. It might be a proper name, a local term in a certain area or a very niche concept.
The 'densha otoko real story' is about a man's experiences on the train. It might involve his daily commute, the people he meets on the train, and the events that occur during his train rides.
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.
Since the title is 'densha otoko real story', 'otoko' means man in Japanese, so it's probably a man. However, without further details, we can't really say much more about him. He could be an ordinary commuter, a train enthusiast, or someone with a unique job that involves a lot of train travel. He might be a shy person who observes a lot during his train rides, or a more outgoing one who engages with other passengers.
Since I'm not sure about the exact content of 'otoko girai light novel', it's hard to say. But generally, light novels can have themes like friendship, coming - of - age, adventure, or romance. It could be any of these or something completely different.