TL;DR: I probably will never write a book or create a game - that doesn't interest me, and the copyright would be a maze to sort through.
That said, when fleshing out my world from the perspective of a character, I do so through Allard Moore, a Huma Scholar serving as King Tyr's librarian and personal assistant. Because of the rising tensions caused by the race to defeat Megabeasts, Allard is sent off by the King to collect data/write a book on the leaders and cultures of the surrounding countries to give Tyreon a leg up on the competition. While doing so, he collects a rag-tag group of travelers who leave a trail of havoc in their wake - notably Ehrun adat Ëlad, a Viël Warrior who was kicked out of their army for misconduct.