Romulus Riddle

Backstory

Romulus Riddle is the illegitimate son of Lord Voldemort and Bellatrix Lestrange.
He was raised by the Malfoys once Bellatrix was sent to Azkaban, with them teaching him dark magic from a young age.
Once he got to hogwarts, he was sorted into Slytherin, yet found himself making friends with Harry Potter, Ron Weasley, and Hermione Granger.
He and Harry are often mistaken for brothers.