Sirius Black might be the one to save Harry. Despite being on the run, he has a strong bond with Harry. When he hears about Harry being sold, he would risk everything to rescue him. Sirius has his own magic abilities and his loyalty to Harry would drive him to be the hero in this situation.
Dumbledore could step in. As the most powerful wizard in the wizarding world, he has a deep connection with Harry. He would likely use his vast network of contacts and his own magic to find Harry. Dumbledore would also be concerned about the implications of Harry being sold and would want to protect him from any potential harm.
One possible plot could be that Harry is sold to a dark wizard. The wizard might want to use Harry for his own dark purposes, perhaps related to the power he holds as 'The Boy Who Lived'. Harry then has to find a way to escape and seek help from his friends at Hogwarts.
Well, Luna Lovegood could be a great ally for Harry. She has an open - minded and accepting nature. She might see something special in Harry even though he's been abandoned and would offer him her unique brand of friendship and support. Dumbledore, if he's still around in the fanfiction, would also be a key ally. He has a lot of knowledge and power and would likely take an interest in Harry's situation, guiding him and protecting him. And then there's the Weasley family. They are known for their warmth and kindness. Even if Harry is abandoned, they might take him in and be his family, with Ron being his closest friend among them.
It could be Luna Lovegood. She has a unique and whimsical personality. Maybe they got drunk at a celebration in the wizarding world and in a moment of drunken folly, they got married. Their relationship could be really interesting to explore, with Luna's eccentricities and Harry's more serious nature.
Hermione could be a potential partner. They have a long - standing friendship and have been through a lot together. Their shared intellectual pursuits and understanding of the wizarding world could make them a great couple who decide to have a baby together.
Dumbledore could be a savior in this fanfiction. He has the power and the wisdom to step in and help Harry. He might have been waiting for the right moment to remove Harry from the Dursleys' influence. Also, there could be a new character, like an old and powerful wizard who has been in hiding but senses Harry's distress and comes to his aid. This wizard could have some unique magical abilities that can protect Harry and help him grow into a powerful wizard himself.
There could be a rival who is from a wealthy and well - connected fashion family. They have all the resources and connections but lack Harry's raw creativity. So, they view Harry as someone they need to squash to maintain their family's dominance in the fashion world. This rival might use their family's influence to get better show venues or exclusive fabric deals, leaving Harry at a disadvantage.
The obvious enemies could be the Ministry of Magic. If Harry is stealing things, even if for good reasons, they would see him as a criminal. The Aurors would be sent after him. Another potential enemy could be some of the dark wizards who might want the same items that Harry is after. They would not want Harry to get in their way and would try to stop him or even capture him to get information on the whereabouts of the valuable items.
Definitely Dumbledore, if he were still alive. He was always a guiding figure for Harry. He could use his wisdom and influence in the wizarding world to ensure that Harry gets the justice he deserves. Also, Neville could be an ally. Neville has grown into a strong and brave character, and he would stand by Harry, offering his loyalty and friendship during this difficult time.
Maybe Dumbledore. He is extremely powerful and has a great deal of knowledge about dementors. He could arrive just in time, using some mysterious and powerful magic that we haven't seen before to rescue Harry. His presence would also add an element of mentorship and guidance as the story progresses.
Another possibility is that the heiress could be a new character entirely, created by the fanfiction author. She could be from a foreign wizarding family that has a claim to something in the British wizarding world. This new character could bring in different cultural elements of magic and challenge the traditional ways of the Hogwarts - centered wizarding society.