In the 'franklin plays the game story', Franklin is likely the main character. He could be a human being with unique traits and qualities. Maybe he is known for his competitiveness in games or his friendly nature towards other players. Without reading the story, we can't be certain about his exact identity but he is the one central to the action of playing the game.
I'm not sure specifically who Jon Franklin is without more context. He could be an ordinary person with a passion for sharing true stories, or perhaps a professional storyteller, journalist, or writer.
Franklin Richards is a fictional character in the Marvel Comics universe. He is the son of Reed Richards (Mr. Fantastic) and Sue Storm (Invisible Woman) of the Fantastic Four. He has extremely powerful mutant abilities and has played significant roles in various storylines within the Marvel Comics.
It depends. Some parts of Franklin might be based on real events or people, but it could also have fictional elements added for entertainment purposes.
I don't think Franklin Murray is part of DC Comics. DC has a vast array of characters, but this name doesn't ring a bell among the popular or established ones.