Lord Voldemort is one of the most feared and powerful wizards. He is known for his cunning and ruthlessness. Formerly known as Tom Marvolo Riddle, Lord Voldemort was the most formidable evil wizard in the entire universe.
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.
Snape is likely superior in terms of Potion making, magics of the mind and Dark magic. McGonagall is however almost certainly superior in her chosen field of Transfiguration. It's hard to say who outclasses who overall. Snape has a wider range of abilities/interests while McGonagall is more of a specialist.
Winner: Snape
The kind of versatility in magical abilities that Snape displayed was almost around the level of Albus Dumbledore and Voldemort, making him easily more powerful than the average wizard and even the members of the Order of the Phoenix and the Death Eaters.
Godric Gryffindor, the founder of Gryffindor house, was one of the most powerful wizards of his age, so powerful that he was said to be the greatest duelist of that era. Always ready for battle, Godric wouldn't just use a simple wand, he'd also wield a mighty sword.
The most powerful wand in the entire Harry Potter universe is the Elder wand — one of the three Deathly Hallows. Made out of the tail hair of a Thestral, the wand can only be handled by the strongest of wizards. Made by Death itself, the wand can be used with the other Deathly Hallows to make one the master of Death.
But in a toss-up between the Hogwarts headmaster and his young protégé, Dumbledore comes out on top. Think about it: he won every award as a student, while Harry just squeaks by; he founds the Order of the Phoenix long before Harry ever joins; and he teaches young Harry pretty much everything he knows.
According to the majority of the users on the platform, Imelda Staunton's Dolores Umbridge takes home the award for the scariest Harry Potter character, and for good reason — not only is she blatantly evil as she is extremely unnerving.
1. Albus Dumbledore. Image via Warner Bros.
Harry is the Heir of Gryffindor (though his powers have been bound by his father when he was a baby), Neville is the Heir of Hufflepuff, Meghan (OFC, daughter of Sirius) is the Heir of Ravenclaw. Harry/Ginny, Ron/Hermione, Remus/Tonks.
1 Hermione Granger Is The Smartest Witch Of Her Age And The Strongest Hogwarts Student In The Series.
Besides Dumbledore, he is also the only wizard ever known to be able to apparate silently. Voldemort was also said to fear one wizard alone, Dumbledore.
Harry's other best friend, the bookish and kind Hermione Granger can't be beaten in the classroom. Harry recognizes her as his year's best student and even said so at some point. But while Hermione can ace any test, she can't quite keep up with Harry on the battlefield.
House-elves could perform magic beyond that of a wizard
Dobby frequently demonstrated himself to be immensely powerful, causing Lucius Malfoy himself to back down with just a point of his finger.
So, had Snape gone all out in the duel against McGonagall in Deathly Hallows, she would have put up a good fight, but he would have prevailed in the end due to his edge in the Dark Arts, Legilimency and Occlumency.
Of the characters in the books, the top-tier wizards are pretty clearly shown to be Dumbledore, Voldemort, and Grindelwald. If one accepts that magic has advanced since ancient times, these three are probably even greater than the Hogwarts Founders themselves.
Bellatrix Lestrange was Lord Voldemort's equal in cruelty, if not worse than him. She was unparalleled when it came up to committing some of the most horrible acts of cruelty and destruction. She truly belonged to the Dark side and loved to embrace it.