* Harry Potter is the titular protagonist of the series. He is a young wizard who learns about his magical heritage on his eleventh birthday and attends Hogwarts School of Witchcraft and Wizardry. He is known for his courage, loyalty, and unwavering belief in good, even in the face of great evil. He is the "Boy Who Lived," the only known survivor of Lord Voldemort's Killing Curse.
* Hermione Granger is Harry's best friend and a brilliant witch. She is known for her quick wit, intelligence, and unwavering loyalty to her friends. She is also a strong advocate for magical creatures and human rights.
The "Riddle" in your question likely refers to Tom Riddle, Voldemort's real name when he was a young boy. He was a student at Hogwarts who exhibited incredible magical abilities and a dark side that ultimately led him down a path of evil.
It's possible you're looking for information on a specific story or situation involving these characters. If you could provide more context, I'd be happy to offer more specific information.