Another wizard who might be the richest in fanfiction could be the goblin Griphook. In the original series, goblins are in charge of the wizarding bank, and they are known to be shrewd with money. In fanfiction, Griphook could be given a more central role where he amasses an even greater fortune through various means, like uncovering long - lost treasures or making very smart financial deals with wizards.
I think it's a bad take. In the official Harry Potter lore, Harry has always been on the side of light. He was the one who faced Voldemort, the ultimate dark wizard, multiple times and defeated him. To make Harry a dark wizard in a fanfic completely distorts the well - established character arcs and the overall positive message of the series.
I'm not sure specifically as there could be many different fanfics with that title. It might be about Harry Potter in his final battle as a wizard, perhaps with new and unexpected challenges, allies, or enemies.
Magical artifacts and connections can also play a part. A wizard who has a connection to a powerful magical artifact like the Elder Wand or the Resurrection Stone (as Harry did) can gain a significant boost in power. In fanfiction, a wizard might discover new and even more powerful artifacts that give them an edge, or they might have a special connection to a magical creature that gives them unique powers.
In the fanfic, perhaps his unique magical abilities or some special encounters could make him a celestial wizard. Maybe he has access to celestial magic that is not seen in the original series.
One popular 'Harry Potter Hit Wizard' fanfic could be 'The Adventures of the Hit Wizard Apprentice'. It might focus on a young wizard's journey to become a Hit Wizard in the Harry Potter universe, with new magical creatures and challenges along the way.
Most likely Harry Potter would be a main character since his name is in the title. And probably his friends like Hermione and Ron would also be involved.
In some fanfics, Harry Potter might destroy the wizard economy by using powerful magic in a way that disrupts normal economic activities. For example, if he were to magically create an overabundance of a valuable resource like gold or a key magical ingredient, it could devalue it and throw the economy into chaos.
One interesting story could be about a new character who discovers a hidden spell in the wizard101 world that has connections to the Harry Potter universe. For example, a spell that can open a portal between Hogwarts and the wizard101 schools.