Descended from Death Eaters they are taking over, and were all in the books/movies. They were all Slytherins too, and around Harry, Ron, Hermione and Ginny's age.

Theodore Tiberius Nott PB: Maciej Zakoscielny (Taken)
a pure-blood wizard who was a Slytherin student in the same year as Harry Potter at Hogwarts School of Witchcraft and Wizardry. He came from a family of Death Eaters and supporters of Pure-blood supremacy. After his mother died, he was raised by his father, who was a Death Eater.

Mafalda Prewett-Nott PB: Izabella Miko (Taken)
Mafalda was born in around 1983 to an accountant father and a Muggle mother. Although her father was most likely a Squib, he did not expect to become the parent of a witch.

Theodore James Nott Jr "Theo" PB: Jackson Rathbone Age: 17 (Taken)
Tiberius Nott Age: 15
Templeton Nott 13
Torilynn Nott Age: 11

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Irfan Mustaq
a wizard and a Slytherin student at Hogwarts School of Witchcraft and Wizardry in the 1990s. He was a member of the Dueling Club run by Karl Limpley in the Clock Tower Courtyard during the 1996–1997 school year.

Imogen Stretton Mustaq
was a Slytherin student at Hogwarts School of Witchcraft and Wizardry. She attended during the 1993–1994 school year and blocked access to an area of the school grounds along with Holden Ledbury in the 1996–1997 school year.

Boy Mustaq Age: 16
Girl Mustaq Age: 15
Boy Mutaq Age: 14

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Michael Lane Robinson PB: Alexander Skarsgard (Taken)
a wizard and Slytherin student at Hogwarts School of Witchcraft and Wizardry in the 1990s. He was seen walking around the school during the 1993-1994 school year.

Zoe Wren Robinson PB: Margot Robbie (Taken)
was a Slytherin student at Hogwarts School of Witchcraft and Wizardry in the 1990s. She was seen walking around the school during the 1993-1994 school year.

Tabitha Zoe Robinson "Tabby" PB: Danielle Rose Russell Age: 17 (Taken)
Matthew Robinson PB: Lorenzo Zurzolo Age: 16
Joshiah Robinson Age: 14

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Nerys Orpington Ledberry
a witch and a Slytherin student at Hogwarts School of Witchcraft and Wizardry in the 1990s. She was seen walking around the school during the 1993-1994 school year.

Holden Ledberry
Holden Ledbury was a wizard and Slytherin student at Hogwarts School of Witchcraft and Wizardry in the 1990s

Girl Ledberry Age: 16
Girl Ledberry Age: 14
Boy Ledberry Age: 12

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Ursula Penkridge Zabini
a witch and Slytherin student at Hogwarts School of Witchcraft and Wizardry in the 1990s. She was seen walking around the school during the 1993-1994 school year.

Blaise Zabini
Blaise Zabini was the son of a famously beautiful witch who had been widowed seven times over by 1996. Each husband's death occurred both under suspicious circumstances and left the already wealthy Ms. Zabini and her son with more money. Blaise was incredibly vain as a child and did not befriend Muggles or Blood traitors.

Boy Zabini Age: 17
Boy Zabini Age: 16
Boy Zabini Age: 15
Boy Zabini Age: 13
Girl Zabini Age: 13
Boy Zabini Age: 11

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Garrick Cornelius Newbourne PB: Michael Fassbender (Taken)
a wizard and Slytherin student at Hogwarts School of Witchcraft and Wizardry in the 1990s. He was seen walking around the school during the 1993-1994 school year.

Agnes Monkleigh Newbourne
was a witch and Slytherin student at Hogwarts School of Witchcraft and Wizardry in the 1990s. During the 1996–1997 school year, she blocked one of the exits in the Herbology Store, forcing Harry Potter to beat her in a duel in order to get past.

Sofie Emerald Newbourne Age: 17 (Taken)
Boy Newbourne Age: 16
Boy Newbourne Age: 13
Girl Newbourne Age: 11

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Graham Montague PB: Ryan Kwanten
a wizard and Slytherin student who attended Hogwarts School of Witchcraft and Wizardry in the 1990s. He played Chaser on the Slytherin Quidditch team from 1993 to 1996 and was a member of the Inquisitorial Squad.

Daphne Greengrass Montague
was a pure-blood witch and a member of the Greengrass family, an old wizarding family and one of the Sacred Twenty-Eight. She began attending Hogwarts School of Witchcraft and Wizardry in 1991 and was sorted into Slytherin House. She was in the same year as the famous Harry Potter.

Boy Montague Age: 17
Girl Montague Age: 15
Boy Montague Age: 12

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Possible PBs:

Skandar Keynes