Parker would definitely react strongly. She and Eliot have a special bond, and she would be very protective of him. She might go into a bit of a frenzy, using her skills to either find the shooter or get Eliot the best care possible.
Nate, as the leader, would also react strongly. He would feel responsible for Eliot getting shot. He'd be determined to make things right, using his strategic mind to figure out what happened and how to make the people responsible pay. He might also be a bit more emotional than usual, showing that he really cares about Eliot as a member of the team.
Asgore would be deeply affected. He has a complex relationship with Frisk, but ultimately he doesn't want harm to come to them. His reaction could be one of shock and regret. He might see this as a sign that his rule over the Underground has failed in some way. Flowey, depending on his state of mind in the fanfiction, could also have a strong reaction. If he has any positive feelings towards Frisk left, he'd be either very sad or extremely angry, and might try to manipulate the situation to his advantage.
If Jules has a family member in the Flashpoint story, they would have an extremely strong reaction. They would rush to her side in the hospital, if it comes to that. They might even try to convince her to leave the dangerous job. Their reaction could add an extra layer of drama to the fanfiction, as Jules would have to balance her family's concerns with her own dedication to her work.
One common plot could be the team's desperate attempt to save Eliot. They might search for the best medical help, while also hunting down the person who shot him. For example, Parker could use her thieving skills to steal medical supplies, and Hardison would hack into hospital records to find the most suitable doctor.
Beast Boy would definitely be one of the first to react. He and Raven have a special bond in the Teen Titans, so if Raven gets hurt, he would be extremely worried. He might use his shape - shifting abilities to quickly get to her side or try to find help.
Harry Potter and Nate Ford could be a likely pair. Harry's experience with facing great evils and his leadership skills combined with Nate's strategic mind in planning heists would make for an interesting dynamic. They could learn from each other's methods of problem - solving.
Perhaps a new character who has a hidden agenda. Maybe someone who has a connection to a current case Gibbs is working on and doesn't want him to get too close to the truth. This person might be working for a larger criminal organization and sees Gibbs as a threat.
Well, it could be a rival of Ciel's in business or in a social setting. Maybe someone who is jealous of his status or wealth and sees shooting him as a way to get ahead.
It could be an old enemy of Ezra. Maybe someone from his past who has a grudge against him for some reason, like a business deal gone wrong or a personal feud.
Perhaps it was someone within Toby's own group who had a hidden agenda. A so - called friend who was jealous of Toby or had some ulterior motives that led them to arrange for the shooting. This would add a lot of drama and betrayal to the fanfiction story.
There might be a new student at Hogwarts who is also from Harry's neighborhood. They could become fast friends with Harry and be a big part of his adventures at school. This character could bring a new perspective to the story as they are also new to the wizarding world.