It is a very uncommon skill, and is typically hereditary. Nearly all known Parselmouths are descended from Salazar Slytherin with Harry Potter being a notable exception. Parseltongue is, when spoken, a hissing sound, similar to that of a snake; as such, normal people cannot understand it.
The ability to speak Parseltongue is usually inborn; a wizard is born being able to speak Parseltongue, and those who are not born with the ability cannot normally learn the language (although, according to the author, Dumbledore may have learned to understand it, and in Harry Potter and the Deathly Hallows, Ron learnt ...
You could be asking if there are people who can speak parseltongue in real life. For this question, the answer would be probably not. I have heard of people who can speak to animals, but none of the snake (yet). The question could also be interpreted as if there are any in the Harry Potter universe.
As Harry Potter Series is from Harry's point of view, the only known parselmouths to him are Tom Riddle aka Voldemort and Harry himself. There may have been others, but they are never mentioned in the books.
At least in Britain, the ability had an association with Dark wizards. This association with the Dark Arts generally caused fear and distrust of those with the ability.
According to some legends, basilisks can be killed by hearing the crow of a rooster or gazing at itself in a mirror. This method of killing the beast is featured in the legend of the basilisk of Warsaw, killed by a man carrying a set of mirrors.
After Voldemort is destroyed, Harry presumingly loses his ability to speak Parseltongue. He is relieved and never attempts to speak it again until the events of The Cursed Child.
Parseltongue has the characteristic of causing an intense feeling of fear to those who are not used to hearing it, which makes studying and learning it very difficult. Spells spoken in Parseltongue receive an increase in power, especially with spells that have a large number of "s" sounds in their pronunciation.
You will need to learn two simple Parseltongue words for your first homework assignment: the words for "yes" and "no". They are as follows: Yes - Sa. No - Ʃe (using a capital "esh"); ʃe (using a lowercase "esh")
With no one to claim him as their own, Tom lived in a Muggle-run orphanage where he felt abandoned and unloved. He slowly realized he was different from others and became obsessed with his powers, believing he was unique and elite.
basilisk, (genus Basiliscus), any of four species of forest lizards of tropical North and South America belonging to the family Iguanidae. The name is applied because of a resemblance to the legendary monster called basilisk (see cockatrice).
Harry, as heir of Gryffindor, possessed the love of this Muggle-born woman in his very blood and was the perfect champion to stand up against the heir of Slytherin.
Mason Riddle is the Son of Tom Marvalo Riddle, otherwise known as Lord Voldemort, and the only American student at Hogwarts School of Witchcraft and Wizardry.
Ron had also practiced speaking Parseltongue, which Fred and George found weird but Ginny found "rather cool". On the first week of school, Ron, Hermione and Harry descended into the Third Floor Corridor to place Tom Riddle's Diary in the Final Chamber.
How did Ginny open the chamber without Parseltongue?
Ginny Weasley opened the Chamber under Tom Riddle's control; however, she only could open it because of Riddle's ability to speak Parseltongue. She was unable to speak Parseltongue afterwards, but Riddle probably told her what to say.
Harry Potter had a few love interests during his time at Hogwarts. Though he eventually settled down with Ginny Weasley, he also had a thing for Cho Chang in his earlier school years. Then, of course, there's his secret love for Draco Malfoy… Wait, what?
Luna married fellow naturalist Rolf Scamander, grandson of Fantastic Beasts and Where to Find Them author Newt Scamander, considerably later in life than Harry, Ron, Hermione, and Ginny, who all married and started families in their early-to-mid twenties.
In the books, Pansy Parkinson has a schoolgirl crush on Draco, and they went together to the Yule Ball. However, there was no true love between them. In the Cursed Child, Draco Malfoy's wife is Astoria Greengrass. Later, after Astoria's death, Draco says that he would “sell [his] soul for another minute with Astoria.”
The scar is no longer dark, and instead has faded almost to his usual skintone. Scars do fade with time, but J.K Rowling wrote in the book that: "The scar had not pained Harry for nineteen years. All was well." Many people believe the fact the scar has gone dormant after he left Hogwarts is why it faded.
In Harry Potter and the Cursed Child, it is revealed that Bellatrix gave birth to Voldemort's daughter Delphi in Malfoy Manor before the Battle of Hogwarts.
