Like Tom Marvolo Riddle (aka Voldemort), Merlin was a Slytherin, an ambitious, powerful wizard. He was a wizarding legend, and, of course, more powerful than the Dark Lord. According to the Harry Potter Wiki, Merlin was “arguably one of the most powerful wizards of all time”.
One of the earliest examples of this is Merlin, a legendary figure in the wizarding community whose abilities in certain areas were surpassed only by his depth of knowledge of the craft. That is true to such an extent that he is the only character who can rightly say he would defeat Voldemort -- and do so quite easily.
According to records from the wizarding world, he is thought to have been among the most powerful wizards in human history. Merlin attended Hogwarts as a Slytherin and displayed a remarkable command of the magical arts. Some claim that he is the most potent wizard ever.
Dumbledore may have been a legendary wizard, but he can't be compared to, well, Merlin, a wizard so legendary even Muggles know of his exploits. Merlin was the world's most famous wizard, and, arguably, the world's most powerful. Fellow Slytherins, you can be proud of our house— the great Merlin himself was one of us!
Grindelwald Is More Powerful and Cunning Than Voldemort
Grindelwald had more power in the Wizarding World up till the final moments of his life. He had more followers, and they were intensely loyal to him. He conquered more of the globe and could perform more advanced forms of magic.
Merlin himself was sorted into Slytherin when he was at Hogwarts, and the young wizard went on to become one of the most famous wizards in history. The Order of Merlin, named to commemorate him, has been awarded since the fifteenth century.
Dolores Umbridge is in a position of power and is allowed to stay in it even after abusing it. Lord Voldemort, on the other hand, is evil, whereas Umbridge believes she is one of the good ones and that her actions are justifiable, even necessary.
And on renouncing the demons, he is also given powers from God: his ability to see the future comes from God. So, Merlin ends up with powers from both demons and from God. He is basically all-powerful as a result. He can see everything in the past, everything in the present, and everything in the future.
Merlin possessed somewhat ill-defined but reputedly powerful magical abilities when wearing his magic cloak. He was shown able to produce virtually any effect that he could conceive. He could battle gods single-handedly, instantaneously teleport anywhere in the world, or summon mythological creatures to do his bidding.
The most powerful sorcerer to ever live.
Albus Dumbledore is the most obvious person who can defeat Voldemort, and the Dark Lord seemed to realize it. Rowling herself has explicitly stated in the books that Dumbledore is the only person Voldemort fears and recognizes as a genuine threat to his own power.
Is Merlin, who has and used magic his whole life, who has learned from Giaus and Kilgharrah, and is the only Dragonlord more powerful than Morgana, who slowly learned to use her magic at first, but then had a crash course from Moruause, who had been trained her whole life with those who practiced the old religion..and ...
Merlin was a wizard that lived during the medieval times and also an ancestor of Salazar Slytherin's descendant, Austin Zygo.
Voldemort intentionally made six Horcruxes, but when he used Avada Kedavra on Harry, he unintentionally created a seventh Horcrux. Instead of dying, Lily's love for Harry created a counter 'curse' known as Sacrificial Protection and saved Harry.
In the prose chivalric romance tradition, Merlin has a major weakness that leads him to his relatively early doom: young beautiful women of femme fatale archetype. His apprentice is often Arthur's half-sister Morgan le Fay.
Merlin's power of Infinity is a unique and incredibly powerful ability that allows her to keep her spells active until she herself chooses to dispel them. That said, it is very likely that any magical effect she incites will live on, even after Merlin herself dies, should she fail to undo it at that point.
Merlin's magic was so powerful he was able to achieve immortality as shown in The Diamond of the Day as he was capable of living forever as he was still alive even in modern times. His immortality may be because of his powerful magic or his destiny that ties him with the return of Arthur.
Kilgharrah is Merlin's mightiest magical creature, by far. His fire isn't only a weapon of destruction but also has strengthening qualities. He is also immune to most magic, even Merlin's, and is capable of telepathy.
Morgana welcomes him and then makes him demonstrate his magical abilities. She suddenly applies an Gean Canach to him, draining him of his powers.
Hall of Fame defensive tackle Merlin Olsen passed away early Thursday at the age of 69. He lost his battle with mesothelioma which he was diagnosed in the last year.
Bellatrix Lestrange (née Black) is the first female Death Eater introduced in the books. Aunt of Draco Malfoy and Nymphadora Tonks. She was introduced in Harry Potter and the Order of the Phoenix. She is the most faithful member of Voldemort's inner circle.
Voldemort apparently believes nothing is worse than death; perhaps his greatest weakness is his inability to love. This is because his mother, Merope Gaunt, gave Tom Riddle Senior (Voldemort's father) a love potion. Because Voldemort was conceived under a love potion, he isn't able to feel or express love in his life.
As mentioned in the book, Dumbledore was 'the only one he ever feared'. Deep down, Voldemort knew that Dumbledore was more powerful than him. He had superior magical capability and possessed important information about Voldemort.