The Tom Riddle that was in there was a memory of his 16 year old self, possibly the piece of soul lodged within. It's not clear what would have happened if Harry died there and Riddle succeeded. JK has only said regarding it, “Voldemort would've been considerably strengthened.”
May 29, 1993: Harry Potter stabs a basilisk fang into Tom Riddle's diary inside the Chamber of Secrets—unknowingly destroying his first Horcrux.
Riddle ultimately changed his name, by way of an anagram, from "Tom Marvolo Riddle" to "I am Lord Voldemort", as a way of removing his own heritage and of exalting himself, and he killed the Riddle family, partly because they were Muggles, and partly because they abandoned him and his mother.
He always knew. He saw Tom grow up to become Voldemort, and he was aware of it. Tom had his followers call him Voldemort before he disappeared after being rejected from the Dada position. He was all ready changing his appearance a bit at that time.
His viciousness to Muggle-borns is connected: Riddle may be half-blood, but Muggle-borns can claim no wizarding heritage, therefore to him they are as low as Muggles themselves. Riddle also hates Muggles because they remind him of his childhood and the Muggle father who deserted him.
The Heir of Slytherin turns out to be Ginny Weasley, who is being controlled via a magical diary that once belonged to Tom Riddle, AKA Voldemort.
He could command it with his Parseltongue and so there was no eye contact . Also we learned that Tom was a cautious and cunning fellow such that he would not be an idiot to come in direct contact with the Basilisk.
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.
Answer (1 of 6): Hagrid knew Tom Riddle from his days at Hogwarts. He didn't know that he was the Heir of Slytherin, but he did know him. Did he know he was Voldemort? Well...
In his youth, Riddle had tortured two children from his orphanage in a nearby cave. It was here, he chose to return to, and thus hid the locket once he had turned it into a Horcrux. For this kill, he simply chose a local Muggle to be his victim.
Obvious spoiler warning! Yep, that happened: Bellatrix and Voldemort had sex sometime around Order of the Phoenix or Half-Blood Prince, and their wild night in bed led to a child named Delphi Diggory/Riddle/Lestrange. According to Delphi herself, she was born sometime before the Battle of Hogwarts.
Draco Malfoy's mother Narcissa was cold, cunning and devoted to the Dark Lord. But she was also a mother, which meant she was willing to risk everything to make sure her son was safe. When Harry survived Voldemort's Killing Curse for the second time, Narcissa pretended he was dead so she could get to Draco.
Though Harry encountered many opportunities that deemed Avada Kedavra necessary, it remains as one of the Unforgivable Curses Harry Potter never cast. For one, he viewed the spell as an immoral practice commonly used by users of the Dark Arts.
Her sacrifice gave Harry the power of love, a protection spell sealed with the blood spilled by her death.
Ginny Weasley, despite being the youngest of the bunch, nearly dies in the Chamber of Secrets after getting too close to the piece of Lord Voldemort's soul that lived in Tom Riddle's diary. Riddle goes on to drain the life from her in order to rejuvenate himself and, at one point, it looks as if he's succeeded.
Yes, they did. The Riddle surname is not a Pureblood name, and it's a name that Tom had at school. Ergo, the other Purebloods knew that Riddle was not a Pureblood. The Pure-Blood Directory also came out in the 1930's, and 'Riddle' was not one of the names listed on there.
The Serpent of Slytherin was a female basilisk placed by Salazar Slytherin inside the Chamber of Secrets at Hogwarts School of Witchcraft and Wizardry. The basilisk could only be controlled by Slytherin's one true heir, Tom Riddle.
Andrea Deanisi as Wiglaf Sigurdsson, the Heir of Rowena Ravenclaw.
We also meet Tom Riddle, who is, as it turns out, the heir of Slytherin. Present only in spirit, he has all the same been controlling Ginny, and having her act as Slytherin's heir.
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.
Dumbledore is quick to point out that Voldemort has killed his own father to avenge his abandonment of Voldemort's pregnant mother. Voldemort does not stop to consider the fact that Merope had placed Tom Riddle under a love spell and forced him into a union he never would have considered otherwise.
Dumbledore didn't take direct action against Voldemort during the First Wizarding War for one simple reason. He was afraid. Not of Voldemort.
He has grown afraid of Harry's connection to Voldemort. Perhaps Voldemort, knowing Dumbledore's love for Harry, would possess Harry and provoke Dumbledore to kill him. So, Dumbledore attempted to avoid Harry throughout Book 5 for Harry's own good.
Narcissa's greatest moment, however, was when she chose to betray Voldemort in Harry Potter and the Deathly Hallows. Not knowing whether Draco was alive or dead, Narcissa chose to lie to the Dark Lord rather than risk losing her son.