Well, if Sirius takes Harry to Voldemort in a fanfic, it would be a huge deviation from the normal story. One possibility is that Sirius is trying to make some sort of deal with Voldemort to save others. But Voldemort is not one to be trusted. Harry, being the Boy Who Lived, is a valuable asset to Voldemort for his own dark purposes. It could lead to a tense stand - off where Harry has to use his own wits and magic, even at such a young age, to try and escape the clutches of the Dark Lord.
In the fanfic, Sirius and Harry leaving England could lead them to a hidden magical island. There, Harry could learn different kinds of magic that are not taught at Hogwarts. Sirius would be able to protect Harry better as they are far away from the threats in England. They might also start a new life where Harry can grow up without the constant fear of Voldemort's followers finding him.
In a 'Harry and Sirius join Voldemort' fanfiction, it might start with Voldemort making a very tempting offer. For Harry, it could be something related to saving his friends or family. Sirius might be lured by the idea of protecting Harry in a different way. However, once they join, they would face a moral dilemma. They would have to pretend to be on Voldemort's side while still holding onto their own values. And there would be a lot of internal conflict as they see the evil deeds happening around them.
Their relationship would be severely damaged. Harry would likely feel betrayed by Sirius. After all, Sirius is supposed to be one of his protectors. It would be a huge breach of trust. Sirius, on the other hand, would probably be filled with guilt if he realizes his mistake. He would have to work hard to regain Harry's trust, if that's even possible in the context of the fanfic.
Well, perhaps they'll meet a really eccentric wandmaker. This wandmaker might have all sorts of unique wand - making techniques. Maybe they'll use rare magical woods or cores that are not commonly used. Harry could be in for a real adventure in this fanfic. He might discover a whole new side to wand - making that he never knew before.
In this fanfic, Sirius could be tipped off that the Dursleys are planning to send Harry away to some even worse place. So he swoops in. They flee to a remote wizarding village. There, Harry meets other wizards and witches who are sympathetic to his cause. Sirius helps Harry train in combat magic, as he anticipates future battles. Harry also gets to explore his magical heritage more freely without the Dursleys' restrictions.
Well, in that situation, Sirius would be shocked and heartbroken. He might first scold Harry for doing something so dangerous to himself. Then, being the impulsive person he can be, Sirius would probably take Harry to see someone he trusts, like Dumbledore or Madam Pomfrey. He would not let Harry out of his sight until he was sure Harry was okay and not likely to do it again.
In the 'Harry takes an ability test fanfic', it could be that Harry struggles with certain parts of the test, but then overcomes his difficulties and surprises everyone with his performance. For example, he might initially seem to be failing at a task related to divination, but then has a sudden insight and aces it. This could lead to him getting special attention from his teachers or even making new friends among his classmates who are impressed by his newfound skills.
Perhaps Harry finds out that his heritage is linked to a powerful and ancient magical line that he was previously unaware of. This could open up new storylines such as him having to learn special spells or abilities associated with that heritage. It might also cause some envy or suspicion among his peers at Hogwarts.
In the 'harry takes ability test fanfic', it's likely that Harry enters the test with a mix of nerves and excitement. The test could be designed in a way that not only assesses his current abilities but also his potential for growth. There may be different sections to the test, each focusing on a different aspect of magic. For example, one part could be about combat magic, where Harry has to face off against magically - created opponents. Another part might be about his knowledge of ancient magic, which he may have learned from his various adventures. And throughout the test, his character could be further developed as he faces different situations and makes choices based on his values.
Well, it could be that Harry is forced to take the blood test. He might be suspicious of the people making him do it. There could be a conflict where he tries to resist at first but then realizes he has no choice. And the person conducting the test might have some ulterior motives that Harry discovers later on.