In some fanfics, there might be a plotline where Palpatine tries to corrupt Anakin even further during the battle, using psychological warfare. Anakin, on the other hand, has to resist this while also fighting for his life. This adds a layer of psychological drama to the physical fight between them.
It really depends on how the author writes it. If the fanfic focuses on Anakin's potential and his growth beyond what we saw in the movies, he could win. For example, if he has fully mastered some new form of lightsaber combat or Force ability.
Their interaction would be intense. Merlin, being from a different era and having a different view of magic, would likely be appalled by Voldemort's use of dark magic. Voldemort, on the other hand, would probably see Merlin as a threat to his power. Merlin might try to reason with Voldemort at first, but when he realizes that Voldemort is beyond redemption, he would use his magic to stop him.
Merlin is from a time when magic was perhaps more primal and less restricted. He has an intuitive understanding of magic that Voldemort, who is more about power - hungry and dark magic, might not fully comprehend. Merlin has been known to perform feats like creating powerful illusions and controlling the elements. Voldemort's main strength lies in the Unforgivable Curses and his ability to create Horcruxes. But in a direct magical duel, Merlin could use his magic to disrupt Voldemort's attacks. For example, he could use his knowledge of nature magic to counter Voldemort's dark spells. Also, Merlin's ability to blend into his surroundings and his quick thinking would make it difficult for Voldemort to land a decisive blow.
Well, Palpatine's background is filled with secrecy and deception. He was a master of political manipulation and used his Sith powers in the shadows to gain control. His early life was marked by his apprenticeship under Darth Plagueis and his plotting to overthrow the Republic.
Maybe Palpatine sees Ezra as a potential tool or apprentice at first. He tries to manipulate Ezra into joining him. Ezra, on the other hand, is conflicted because he might see some good in Palpatine's grand plans for the galaxy, but eventually realizes the cost of following the dark side. Their relationship would be a complex dance of manipulation and resistance.
Maybe some of the Jedi Council members. They were the ones who were constantly in conflict with Palpatine's plans, so they could be in the story to show the power struggle between the Jedi and Palpatine.
Percy would win. His powers are based on the elements which are a fundamental force. Voldemort's magic, while powerful, is limited to the wizarding world's rules. Percy can call upon water from anywhere, and that's a huge advantage.