Harry Potter Characters and Details

Harry saw only a single galleon in the Weasley's vault at Gringotts, highlighting the family's poverty. This small amount emphasized their financial struggles.

Hermione was partnered with Pansy Parkinson for her Charms OWL practical, which she found unpleasant. The others listed were partnered with different students.

Professor Tofty, an external OWL examiner, asked Harry to produce a Patronus during his Defence Against the Dark Arts practical exam to demonstrate advanced magic.

Fenrir Greyback was a werewolf who worked with Voldemort but was not formally a Death Eater (he couldn't be branded with the Dark Mark). Avery, Travers, and Rookwood were actual Death Eaters.

Harry first saw Sirius Black in Magnolia Crescent, under the street lamp, when he thought Sirius was a murderer. This was before Harry knew Sirius's true identity.

Hagrid was in Knockturn Alley to buy Slug repellent, a product used to keep slugs away from magical gardens. He found Harry there after the Dursleys had abandoned him following Voldemort's attack on the Potters. 'Slug horn' is actually a character (Horace Slughorn), not what Hagrid was shopping for.