The main character in 'the leather man story' could be a man with a passion for leather. Maybe he discovered some new techniques in leather - making and his story is about his journey to share and promote these techniques, facing competition and skepticism along the way from traditional leather - makers.
Since I don't know the exact 'Leather Man Story', I can't say for sure who the main character is. It could be a man named Leather Man, if it's a story named after a person.
There are several characters in 'Pulp Fiction' who could potentially be described as a 'guy in black leather'. It could be one of the hitmen, for example. But without more specific details, it's hard to say exactly who is being referred to.
I'm not entirely sure as there could be many different 'chew visual novels'. Generally, a visual novel is a form of interactive fiction. It might be about a unique story, perhaps with interesting characters and different plotlines that the player can experience through reading text and making choices.
It could be the protagonist. Usually, in a story, important items are associated with the main character, and the leather jacket might be something that defines them at the end.