Red-haired Muggle boy

In order to disguise Harry Potter during the wedding of Bill and Fleur Delacour, Fred Weasley stole a few hairs from the head of a local Muggle boy. This boy's hair was red in colour and slightly plump as Harry mentioned being uncomfortable in his dress robes for the boy he impersonated was slightly fatter than him. However, it has to be noted that Harry is rather thin.

The boy's hair were placed in Polyjuice Potion, allowing Harry to be his double.