In the 'Kuga Game of Chase Vore Story', Kuga is probably a very important character. Given the name, Kuga is likely to be the focus of the story. He or she (we don't know the gender from the name alone) might be a brave adventurer in the game, or perhaps a target in the chase. The story could revolve around Kuga's actions, decisions, and interactions during this chase scenario and whatever the 'vore' aspect implies in relation to Kuga.
Yuma and Tori could be characters from a small - scale, indie story that has a dedicated but not widely - known fan base. The fanfiction allows fans to expand on their relationship, imagining their married life in ways that the original story might not have delved into deeply, perhaps adding more depth to their characters and their connection.
The unique world - building makes 'world trigger novel' interesting. It has a distinct setting with the concept of the Neighbors and the Trigger system.
The 'world trigger visual novel' probably delves deeper into the backstories of the characters in the World Trigger universe. For example, it might explore how the agents of Border came to be, their training, and their personal struggles. It could also provide more details about the Neighbors, their culture, and their motives for invading Earth. It offers fans a chance to experience the story from a different perspective, with different narrative choices and paths.
I'm not entirely sure as it's not a very common or well - known mainstream story. It could potentially be about a character named Kuga involved in a chase scenario within a game, and perhaps 'vore' might be some sort of unique in - game mechanic or concept that is central to the story.
Osamu Mikumo is quite popular. His growth as a character in the original series makes him a great focus in fanfiction. He can be written in various scenarios where he overcomes more challenges. Yuuma Kuga is also popular as his unique abilities and his mysterious past offer a lot of room for exploration in fanfiction.