Nigel Planter is a dorky wizard who goes to Toadblatt's School of Witchcraft and Wizardry. His character is a parody of Harry Potter, as is the school he attends. He is a member of the Weaselthorpe House and has an L-shaped pen mark, aka "scar", on his head. This "scar" was apparently given to him by Lord Moldy Butt. It's possible that the "L" shape could stand for "loser", since Planter is highly unpopular, and has been expelled from Toadblatt's School of Sorcery.