Joey might be really impressed. He could be like a kid in a candy store, wanting to see how all the cool Batfam gadgets work. For instance, when he sees Batman's utility belt, he might be constantly asking questions about what each gadget does.
He might try to engage Slade in conversation. Nightwing is smart and could be looking for a way to psychologically get an edge over Slade. He could be probing for Slade's motives, hoping to find a way to turn the situation around. He might also be stalling for time, waiting for the right moment to make his move.
Nightwing would initially be defiant. He's a highly trained fighter and detective in his own right. So, he won't cower in front of the Joker. He'll probably try to size up the situation, looking for any weaknesses in his captivity and the Joker's plan.
Dick would probably be excited. He loves the idea of fans being so engaged with their world and would enjoy reading the different takes on their relationships. He might even leave positive comments if he could.
Some Avengers might be excited. Captain America, for example, would probably welcome Nightwing for his sense of justice and fighting skills. Thor might be intrigued by this new addition from another world (in a sense, as Gotham is different from Asgard). However, Hulk might not care much as long as Nightwing doesn't get in his way during a fight. Overall, there would be a mix of curiosity and acceptance.
His brothers would likely be very protective. They might immediately go on the offensive against whoever hurt Nightwing. For example, if it was an enemy attack, they would fight back fiercely. They would also be concerned about his well - being and quickly try to assess the extent of his injuries.
Well, a very common theme is the exploration of power. In criminal Batfam fanfic, the power dynamics within the family change when they are involved in criminal - related situations. For example, who has the authority to make decisions when the family is on the wrong side of the law? Also, redemption is often a theme. Characters who have strayed into criminal behavior may seek to redeem themselves. And secrecy is another key theme. Keeping secrets from each other can be both a cause and a consequence of getting involved in criminal activities in these stories.
One popular batfam fanfic could be 'Family Dynamics'. It explores the complex relationships within the Bat - family in a really interesting way. The characters are well - written and it delves deep into their emotions.