Draco's parents, especially Narcissa, would be devastated. She would do everything in her power to save her son. She might even turn against the very dark forces she has been associated with if they were the ones pushing for Draco's death. Lucius, too, would use all his influence and resources to try and change the sentence.
Hermione would likely be more analytical. She might start researching the legal aspects of the case, looking for loopholes or signs of a miscarriage of justice. She would be outraged if she thought Draco was being wrongly accused, as she values fairness and the rule of law in the wizarding world.
Obviously, Draco is one of the main characters. There could also be Harry Potter and his friends. Maybe Hermione, as she often gets involved in things related to rules and punishments at Hogwarts. Or it could be some other Slytherin characters like Pansy Parkinson who might react to Draco's situation in different ways.
Harry would probably be furious. He's always been protective of Hermione, and he'd see Draco's actions as completely unacceptable. Ron might be a bit more vocal about it, perhaps even getting into a fight with Draco. Ginny, on the other hand, would likely comfort Hermione and be very supportive. Neville could be shocked and disappointed in Draco, as he's a character who values loyalty.
Ron would be furious. His best friend being 'stolen' by his former rival would make him feel a mix of anger, betrayal, and jealousy. Harry would probably be in a difficult position. He's friends with both Ron and Hermione, so he might try to mediate at first, but if Draco is being difficult, he'd side with Ron. Ginny would be protective of her brother and would likely be very critical of Hermione for choosing Draco. The Slytherins, on the other hand, might be initially shocked but then accept it as Draco asserting his power and getting something he wants.
The Saiyans, like Nappa, might be dismissive. He is used to a certain type of combat in the DBZ universe and might not take the fanfiction seriously. He'd see it as a waste of time or just something for weaklings. However, characters like Bulma, who is smart and curious, might be interested in the scientific or technological aspects that could be presented in the fanfiction. If there are new gadgets or technologies in the Death Battle fanfiction, she'd be eager to study them.
One way it could develop is through Draco getting involved in a dark magic plot gone wrong. Maybe he was forced to participate by the Death Eaters in his family, and when things got out of hand, the wizarding world decided on a death sentence for him. In some fanfictions, the political climate in the wizarding world might be so strict that any association with dark magic at that level is seen as unpardonable.
Harry would likely be very protective of Hermione. He's her best friend, after all. He might confront Draco immediately and try to get Hermione to see that she doesn't deserve this. Ron would probably be angry too, and might even be more impulsive in his reaction, perhaps getting into a fight with Draco.
The Malfoy family's reputation would take a big hit among the pure - blood families. Many of them would see Lucius as a traitor for befriending Harry. But some of the more open - minded pure - bloods might start to think differently. As for the Gryffindors, some would follow Ron's lead and be hostile, while others, like Neville, might be more open to the idea. After all, Neville has also seen the good in people who were once considered enemies.
Sakura might be worried about Naruto. She could try to comfort him and encourage him not to give up. She might also be angry at Jiraiya for abandoning Naruto, seeing how much Naruto has been through already. Kakashi, on the other hand, would probably step in more as a mentor. He has his own way of teaching, and he'd want to make sure Naruto doesn't go astray.
Hermione would probably be shocked at first. But then she would try to find a way to help Harry through it, using her vast knowledge of magic to figure out what's going on.
It could be about Draco being in a situation where he's somehow sentenced to a kiss. Maybe it's a part of a magical punishment or some sort of bet in the wizarding world of the fanfiction's setting. It might involve his relationships with other characters, like his enemies or love interests.