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.
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.
Draco would surely interact with the Dursleys. Vernon would probably be very suspicious and hostile towards Draco at first, seeing him as another strange and magical being. Petunia might be a bit more reserved but also curious in her own way. Dudley could range from being intimidated by Draco's wizarding background to being fascinated. And don't forget about Hedwig! If she's still around, Draco might have some sort of interaction with the owl, which could be really funny or interesting as he tries to figure out how to deal with this magical creature in the Muggle - dominated Dursleys' household.
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.
One character could be a Muggle schoolteacher. Draco might enroll in a Muggle school to blend in, and this teacher could take an interest in him. They could have conversations where the teacher tries to understand Draco's 'different' background (without knowing he's a wizard, of course). Another could be a Muggle mechanic. If Draco has some issues with a Muggle vehicle or machinery, he'd interact with the mechanic, and it would be a funny and challenging situation for him as he tries to understand how non - magical machines work.
Hermione might be one of his allies. Despite their past differences, they could put aside their grudges for the greater good of the Horcrux hunt. Also, Neville could potentially be an ally. Neville has shown great courage and determination, and he might see Draco's newfound willingness to fight against Voldemort as a sign of change.
Obviously, Draco Malfoy and Dudley Dursley are the main characters. Draco, with his blond hair and aristocratic air, is a well - known Slytherin from the Harry Potter series. Dudley, on the other hand, is Harry's cousin, a rather large and spoiled Muggle boy. Their encounter would be the central focus of this fanfiction.
Harry Potter and his friends could be important characters as well. Their relationship with Draco could be explored in different ways. Maybe they start to see Draco in a new light and begin to trust him a little more. Hermione Granger, with her intelligence and strong moral compass, could play a role in Draco's redemption or self - discovery journey.
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.
There could be some original Muggle characters created just for the fanfiction. Maybe a friendly Muggle neighbor who is always curious about Draco's strange ways and in turn, makes Draco curious about the Muggle world. This neighbor could introduce Draco to things like Muggle sports, like football, which Draco would find both strange and exciting.
There could also be other characters from the Harry Potter universe. For instance, Draco's mother Narcissa might be involved. She could be either trying to protect Draco from Lucius's influence or be in denial about Lucius being such a negative figure in Draco's life. Additionally, Draco's schoolmates like Crabbe and Goyle might play a role, perhaps they notice Draco's strange behavior when Lucius - as - Boggart is around and try to help in their own clumsy ways.