Yes, in Batman: Enemy Within, you can continue the story. There are multiple paths and decisions throughout the game that allow you to progress and see how the story unfolds. Each choice you make can have different consequences, which adds to the replayability and the continuation of the overall narrative.
It's most likely fictional. Usually, stories like 'Enemy Within' are crafted by the imagination of the author or writers to engage and thrill the audience rather than being based on real events.
Well, in fanfiction, it's possible that a character who has been bullied or marginalized at Hogwarts could turn into the enemy within. They might feel that the school has failed them and seek revenge. It could also be a character who has been exposed to some dark magic accidentally and is now being controlled by it. A jealous student, perhaps someone envious of Harry's fame, could also be a candidate for the enemy within as they might be willing to side with the real enemies to bring Harry down.
It's purely fictional. The plot and characters of The Enemy Within are the product of the author's imagination and not drawn from any actual incidents or people.
Definitely not. 'The Enemy Within' is a made-up story. It doesn't draw from real-life incidents or experiences. The author came up with the whole concept to engage and thrill the audience.
One aspect to consider in 'pokemon battling the enemy within fanfiction' could be the internal struggles of the pokemon themselves. For example, a pokemon might be battling its own fears or insecurities which could be personified as an 'enemy within'. This can add depth to the character development within the fanfiction.