Prejudice is a big one. There has been a long - standing rivalry between Gryffindors and Slytherins. So, Harry has to overcome the initial distrust from both sides. His Gryffindor friends might be skeptical of his new Slytherin acquaintances, and the Slytherins themselves may be wary of his intentions.
Well, it could be due to a common enemy. Let's say there is a new threat in the wizarding world that targets both Gryffindors and Slytherins. Harry, being the hero he is, realizes that they need to work together. He reaches out to the Slytherins, and they start to bond as they fight side by side against this new danger. They learn about each other's strengths and weaknesses during the process.
He also has to deal with the secrecy around wand - making. Since it's a highly guarded art in the wizarding world, he might face opposition from the Ministry of Magic or other wizards who think he's meddling in something he shouldn't. Plus, he has to make sure that the wand he crafts is unique to him and suits his style of magic, which is no easy feat.
Politics within Asgard could be a challenge. There may be different factions or groups who have different opinions about allowing an outsider like Harry to become a member. He might have to navigate through these political intrigues and gain the support of key figures in Asgard, like Thor or Odin, in order to finally become a member.
One major challenge is the Dementors. They are extremely dangerous and can suck out a person's soul. Harry has to find a way to either avoid them or defeat them. Another challenge could be the security measures in Azkaban. There might be magical locks, guards, and other barriers that he needs to overcome.
The third challenge could be acceptance. The people in Konoha may be skeptical of a stranger from a completely different world trying to open a shop. They might not trust his magical items or be afraid that his presence could disrupt their way of life. Harry would need to prove himself trustworthy and show that his shop can bring benefits to the community.
One challenge could be resistance from the existing authority. There might be some teachers or administrators who don't want to give up their power easily. They may see Harry as too young or inexperienced.
One challenge could be dealing with his cousin's non - magical mindset. Since Harry is a wizard and his cousin is likely a Muggle, the cousin may not understand or believe in magic at first. This could lead to a lot of misunderstandings. Another challenge might be protecting his cousin from the wizarding world's dangers without scaring him too much. For example, there could be dark wizards or magical creatures that pose a threat.
One challenge could be the lack of the traditional focus for his magic. Without a wand, he might struggle to direct his magic precisely. For example, when he tries to cast a simple levitation spell, he may end up making objects fly out of control.
One challenge could be the speed of the train. If it's moving too fast, it's difficult for him to just grab onto it without getting hurt. Also, the train's momentum is a big issue. It would be really hard to stop it suddenly.
One challenge could be dealing with jealousy from other villages. His godlike powers might make other villages feel threatened. Another issue could be managing the different personalities and abilities of the people who come to live in the new village. He has to make sure everyone gets along.