Harry Potter could be a supporting character. He might be initially suspicious of Draco living with Sirius but then come to understand the situation. Hermione could also be there, trying to help Draco with his studies and also guiding him morally. Ron would probably be the one with the most doubts, but his loyalty to Harry and Sirius might make him tolerate Draco's presence. Lupin could be another supporting character, as he is a friend of Sirius and could offer his wisdom in dealing with Draco.
Some of the likely supporting characters would be the other members of the Order of the Phoenix. Tonks could be a fun and friendly presence, making Draco feel more at ease. Kingsley Shacklebolt could be a role model for Draco in terms of what it means to be a good wizard in the fight against the dark side. And then there's Hagrid. He could introduce Draco to the magical creatures in a more positive light than Draco has experienced before, which could be a big step in changing Draco's perspective.
In the 'sirius adopts draco fanfiction', the plot might involve Sirius rescuing Draco from a dangerous situation at home. Sirius might see a bit of himself in Draco, like the struggle between good and bad. As Draco starts living with Sirius, he is exposed to a whole new way of life. Sirius tries to get Draco interested in the Order of the Phoenix's cause. Draco, on the other hand, has to adapt to a more inclusive and less prejudiced household. There could be a lot of conflict within Draco as he tries to balance his old identity as a Malfoy and his new life with Sirius.
Maybe some of Draco's old Slytherin friends or acquaintances make an appearance. They could either support or oppose Draco's decision to adopt Rose, depending on their own views and how they've changed since their school days.
The main characters would be Carlisle and Harry. Carlisle is the adoptive father, so he'll be responsible for Harry's well - being in this new family. Harry, of course, is the central figure as the adoptee. However, we can't forget about the rest of the Cullen clan. Alice, for example, might use her power to foresee any potential dangers that could come to Harry. Jasper could help Harry with self - control, as he has his own struggles with it. So, all these characters would be integral parts of the fanfiction.
Well, Ginny might interact with Draco if he's a maid in the fanfiction. She's a strong - willed character and her response to Draco in this new role could range from amusement to irritation. Another character could be Ron. Ron has always had a bit of a feud with Draco, and seeing him as a maid might bring out different reactions from Ron, like teasing or even a bit of begrudging respect if Draco does his job well. And of course, the other Slytherins might interact with him too. They could be embarrassed by his new position or try to help him depending on their individual personalities.
Dumbledore could play a significant supporting role in some versions. He might be guiding Hermione in her new role as Harry's guardian from the shadows. Neville Longbottom could also be a supporting character. He could be Harry's study partner when Hermione is busy, and they could exchange knowledge about different plants and potions. And of course, the Weasley family as a whole might be there to support them, with Molly Weasley perhaps cooking them delicious meals from time to time.
Hermione could be a big part of it. She might be the one who discovers the magic or the theory behind Harry being able to adopt himself and helps him work out the details. She could also help with taking care of the younger Harry, teaching him things like how to study magic more effectively.
Definitely Hagrid. Hagrid has always been around Hogwarts and has a connection to the students. Sirius could interact with Hagrid if he goes back in time. Maybe Hagrid could help Sirius in some way, like providing shelter or information. And Bellatrix Lestrange could also be in the picture. Since she is part of the Black family, Sirius might have to deal with her in the past, either to try to change her or to stop her from doing something evil.
Obviously, Percy and Hades will interact a great deal. Percy will also likely interact with the Furies, as they are servants of Hades. They could be like his protectors or trainers in some sense. Another character could be Nico di Angelo, since he has a connection to Hades as well. They could bond over their shared relation to Hades.
His Slytherin friends like Blaise Zabini and Pansy Parkinson could be important characters. They might be in a difficult position. Do they try to help Draco despite the potential risks? Or do they abandon him? Another character could be Dumbledore. He often has a broader view of things and might see Draco's chained state as an opportunity for him to change. He could offer guidance or be the one to set certain events in motion regarding Draco.
The other Slytherin students are very likely to be involved. Some might side with Draco, while others might see his punishment as an opportunity to gain power within the Slytherin hierarchy. Pansy Parkinson, for instance, might react in different ways depending on her relationship with Draco at the time of the punishment.