Well, an overpowered MC usually has insane strength, skills, or abilities that make them way ahead of others. They can easily overcome challenges and enemies with little effort.
Some of the top MC manhwa include 'The God of High School' and 'Solo Leveling'. They're popular for their exciting storylines and well-developed characters.
In the 'harry shows his power fanfic', perhaps it's a story where Harry has to show his power in a wizarding competition. He might use his unique abilities like Parseltongue to outwit his opponents and prove his worth. He could also draw on his connection with the Patronus charm to protect himself and others during the tasks.
There are fanfictions where Naruto's power is shown through his ability to connect with the spirits of past Hokages. With their combined wisdom and his own strength, he's able to perform a super - powerful jutsu that not only protects Konoha but also restores the balance of the ninja world. He uses this new - found power to face an ancient evil that has been awakened.
The OP MC in manhwa reincarnated stories is typically characterized by exceptional strength, intelligence, or magical abilities. They may have a hidden past that ties into their current powers and often face powerful enemies to showcase their dominance. Their growth and development throughout the story are what make them so compelling to readers.
In this fanfic, Harry is the main character. However, we could also expect to see Dumbledore making an appearance. Dumbledore has always been a guiding figure for Harry, and in a story about Harry showing his power, Dumbledore might offer some wisdom or crucial information. Neville could also be a key character. He has his own growth in the original series, and in this fanfic, he could be inspired by Harry's power and contribute to the overall plot in some way.
The connection could be that the MC acquires the Buddha Palm through a special training or encounter, and it becomes their signature move in the manhwa. It might also have some hidden powers or limitations that add to the story's intrigue.