The Weasley family, especially Arthur Weasley, could be involved. Arthur, being an employee at the Ministry, might know some inside information about Fudge. He could assist Harry either directly or by providing some useful connections within the Ministry to get Fudge fired.
Well, it could be that Harry discovers some major misdeeds by Fudge. Maybe Fudge has been covering up dark magic activities within the Ministry. Harry then finds evidence and presents it to the proper authorities, leading to Fudge's dismissal.
Well, in many fanfictions, Harry might use his quick thinking and knowledge of magic. For example, he could use spells in unexpected ways to get around Fudge's plans. Maybe he uses a charm to make Fudge misinterpret a situation or forget an important detail. Harry is known for his resourcefulness, and against Fudge, he could use his skills to expose Fudge's wrongdoings or prevent Fudge from interfering in things that Harry believes are right.
Obviously, Harry Potter is a key character. He is the one who is going to put Fudge in his place. Harry has always been a symbol of truth and justice in the wizarding world, so he has the moral high ground to confront Fudge.
Maybe Fudge was starting to turn against the wizarding community in more extreme ways. For example, if he was planning to persecute Muggle - borns more harshly or side with the Death Eaters secretly. Harry, being a defender of justice and equality in the wizarding world, would not tolerate such actions and might have been pushed to kill Fudge to stop his evil plans.
I'm not sure if 'Fudge Forces Harry' is a common theme in fanfiction. It could be a very specific or even an unusual concept that only a few fanfiction writers might explore. There are so many different themes and ideas in the vast world of fanfiction, and this one might not be mainstream.
Hermione Granger would be a great addition. She is known for her research skills and intelligence. She could dig up old Ministry records or laws that are relevant to the trial. Also, members of the Wizengamot would be key. They are the ones who will ultimately decide Fudge's fate, and different members might have different biases and motives which could affect the trial's outcome.
One common theme is power and corruption. Fudge is often depicted as being power - hungry and making corrupt decisions in fanfiction, just like in the original books. For example, some stories show him using his position to suppress information or manipulate other characters for his own gain.
One key moment could be when Harry describes the battle at the Ministry of Magic. His account of fighting Death Eaters and Voldemort's presence there would be a strong evidence against Fudge's claim that Voldemort is not back. Another might be when Harry reveals secrets about the Death Eaters' activities that Fudge has been trying to hide.
In some fanfictions, Harry might use his first - hand experiences of Voldemort's return. For example, he could present the details of the graveyard encounter where Voldemort was resurrected. His eyewitness account, including the presence of Death Eaters, directly contradicts Fudge's denial of Voldemort's return.
It could also be related to the treatment of Harry's friends or allies. Suppose Fudge is persecuting Dumbledore or other Order of the Phoenix members. Harry, who is loyal to his friends and those fighting against the Dark Arts, would be enraged and yell at Fudge. He wouldn't stand for any harm coming to those he cares about, and Fudge's actions in this regard would surely provoke Harry's anger.