There might be a new student at Hogwarts who is also from Harry's neighborhood. They could become fast friends with Harry and be a big part of his adventures at school. This character could bring a new perspective to the story as they are also new to the wizarding world.
Ron might support Harry at first. Since he's Harry's best friend, he would be on Harry's side without really knowing the full story. He'd probably offer to help Harry with some of his revenge plans, like distracting Ginny while Harry sets up a magical prank.
Ron would also be there. He might start out a bit reluctant, but then get into it. He could be Harry's partner in physical challenges, like having races on broomsticks or wrestling magical creatures in a controlled environment for fitness.
His friends from Hogwarts like Ron and Hermione. They are always by his side and would probably be more than happy to help Harry get revenge on the Dursleys. They might use their magic skills together to create some really interesting revenge scenarios.
Obviously, Harry Potter himself is the central figure. His friends like Ron and Hermione would also be involved. They would support Harry in his revenge plans, with Ron providing his loyalty and Hermione using her intelligence to strategize. Ginny Weasley might also be part of it, as she is Harry's love interest and a strong - willed witch in her own right.
Obviously, Harry Potter himself is the main character as he is the one getting back at the Dursleys. The Dursleys - Uncle Vernon, Aunt Petunia, and Dudley - are also main characters as they are the targets of Harry's revenge.
In 'Aria Gets Kidnapped Fanfiction', a group of her classmates could be the ones to rescue her. They might form an impromptu rescue team, pooling their different skills. One could be good at hacking and find the kidnapper's location through digital means, another could be athletic and lead the charge when they reach the kidnapper's lair. Additionally, an unexpected ally, like a character who has always been in the background but has a hidden talent or power, could come forward to rescue Aria. This could add an element of surprise to the story.
Hermione is a very likely candidate. With her intelligence, she could easily start a business. For example, she might open a library - like establishment but with rare and restricted magical books that she has managed to collect through her research. She could charge a membership fee for witches and wizards to access these valuable resources.
Draco Malfoy is a likely candidate. He's often portrayed as a rival to Harry in the original series, and in fem Harry fanfictions, he might be even more likely to betray her. He could see Fem Harry as an easy target to gain more power or status within the Slytherin house. Another one could be Pansy Parkinson. She's known for her mean - spiritedness, and she might betray Fem Harry out of envy or just to cause trouble.
Obviously, Harry Potter himself would be the central character. He's the one getting the tattoos after all.
Hermione would definitely be one of the first to help. She's extremely intelligent and well - read in magic, so she'd quickly start looking for spells or potions to heal Harry. She'd also stay by his side to comfort him and keep his spirits up.