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The one key detail that leads me to believe Bada is not meant to be an NPC is that his love for horror/slasher content is his large defining characteristic. For an NPC who was not even originally supposed to partake in the main storyline(which is horror), it would make no sense for the author to flaunt that detail unless Bada is a key character in solving the story or they are foreshadowing that he is someone of higher importance, such as a game dev or beta tester