Roger is plump and ordinary-looking, taking after his mother. He is pale, and has a tendency to breathe heavily, both probably side-effects of his plumpness. He is not allowed marmalade, which is not surprising considering how much he piles on when he gets the chance.
He is learning witchcraft from Michael Saunders. Despite being under orders not to use magic without adult supervision, he and Julia often animate their toy soldiers when they play with them.