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.
In my opinion, Hermione Granger would likely win. Hermione has demonstrated time and time again her ability to think on her feet and use her knowledge in creative ways. She's not just book - smart, but she can adapt magic to different situations very quickly. Lily Potter was no slouch, but we don't have as many examples of her in complex magical battles. Hermione has faced Death Eaters and all sorts of dangerous situations and come out on top, so I think she'd be the victor in a duel against Lily.
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.
In my opinion, Batman would probably win. Batman has a vast array of high - tech gadgets and is a master of many forms of combat. He's also a brilliant strategist. Green Arrow, while an excellent archer and fighter, doesn't have the same level of gadgetry and has been shown to be a bit more impulsive at times. But it really depends on the circumstances of the fight in the fanfiction.
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.
Well, Yuuto is a very determined and strong character. He has his own set of skills and the will to fight for what he believes in. However, Seigen is also highly skilled and experienced. If we consider their powers, Yuuto's growth throughout the series gives him an edge. But Seigen's knowledge and combat experience cannot be underestimated. So it's really a tough call. It could depend on the circumstances of the duel in the fanfiction.
In some fanfictions, Voldemort wins through a change in the prophecy's interpretation. If the prophecy was misread, it could give him an edge he didn't originally have.
Well, Obi - Wan Kenobi has shown time and again his ability to adapt to different opponents. He defeated General Grievous, a formidable foe. Pong Krell, on the other hand, was consumed by his own dark desires. When it comes to a fight between them, Obi - Wan's use of the Force for defense and offense, his lightsaber skills which are refined over years of training, and his wisdom in combat situations would make him the victor. He can sense his opponent's moves and counter them effectively, something Krell's overconfidence might not be able to handle.
In Harry Potter fanfiction, it's really hard to say who would win in a wizard duel. It could be a character like Harry himself, with his unique skills and the power of love on his side. But then there are also powerful dark wizards that could be created in fanfiction, who might have new and terrifying spells.
The plot could start with Merlin somehow being transported to the world of Harry Potter. He quickly realizes the threat of Voldemort. He begins to gather information about Voldemort's weaknesses. Maybe he befriends some of the Hogwarts professors who help him in his quest.
One possibility is that Merlin uses his ancient and powerful magic. He might be able to counter Voldemort's dark spells with his own brand of magic that is based on nature and balance. For example, Merlin could use his ability to control the elements to disrupt Voldemort's attacks.