The group as a whole would be very worried about Nico's well - being. They would put aside any differences they might have had and work together. They'd also be worried about what the kidnapper might be doing to Nico. They might fear that he's being tortured or used for some evil plan. So they would be in a hurry to rescue him before any real harm comes to him.
Percy might be angry at first. He's used to being a loyal friend, so betrayal would hit him hard. He'd probably try to find out the truth and clear his name. Jason, being a more diplomatic type, might initially be shocked and then try to reason with those who betrayed him. Nico, on the other hand, could retreat into himself. He has a more solitary nature, and the betrayal might make him even more withdrawn.
Nico could initially be shocked and scared. But as he regains his composure, he would likely start to analyze the situation. He might try to communicate with the Avengers, especially if he realizes they are not pure villains. He would use his wits to find a way out of the situation while also trying to understand their motives for kidnapping him.
Nico might be initially shocked. He could feel a deep sense of anger towards whoever was responsible for Percy's abuse. Then he would probably become very protective of Percy, vowing to keep him safe from any further harm.
It's likely a visual novel related to the 'Nanbaka' series. It might include the unique characters, settings, and storylines from the original 'Nanbaka' work, perhaps with interactive elements and different plot branches for players to explore.
Annabeth would be furious. She'd immediately start planning a rescue mission. She might call on all of Percy's friends and allies at Camp Half - Blood. Annabeth would use her strategic mind to figure out where Nico has taken Percy and how to get him back.
The students would be in awe. Percy's heroic deeds would make him a star among the students. They would be eager to learn from him. Thalia's cool and powerful aura would intimidate some but also draw others. Nico's dark and mysterious nature would fascinate the more adventurous students. Some might be scared at first, but overall, they would be excited to have such different and powerful teachers.