Sure does. The story quest for Kazuha is quite interesting and reveals more about his journey and motivations. It adds depth to his character in the game.
Inner Mongolia's Siziwang Banner and Siwangzi Banner were the same place. The Siziwang Banner was a flag of the Inner Mongolia Xilin Gol League, and the Siwangzi Banner was a town under its jurisdiction. Therefore, the two were different names for the same place.
You can try some popular fanfic websites like Archive of Our Own (AO3). It has a large collection of fanfics, and you might be able to find Heiji x Kazuha lemon fanfics there.
One reason could be the strong dynamic between Heiji and Kazuha. Their relationship has a lot of potential for interesting stories. The 'lemon' aspect might add a touch of romance and tension. Fans are often drawn to exploring the deeper emotions and interactions between the two characters in this kind of fanfic.
Bruce Banner is still alive in the comics. His storylines have many ups and downs, but death hasn't been the ultimate fate for him. He keeps coming back stronger.