Perfect Peter is Horrid Henry's little brother and one of the main antagonists and a supporting protagonist of the Horrid Henry franchise.
In people's eyes, he is the adorable, selfless, compassionate, charismatic, sweet-hearted, kind and innocent child that he believes himself to be. He adores fruit and veg, physical exercise, cleanliness, school and books - these factors make people always think the best of him. However, he is in fact another character entirely.
He is incredibly arrogant, selfish, condescending, cowardly, egomaniacal and boastful.
He is used to getting his own way, and to getting away with everything that he and his brother both do. He also takes an almost sadistic joy in exposing his brother's activities to his parents because it means he gets praised.
He has a weakness that is frequently spurring his doings throughout the franchise: he adores being the centre of attention, and becomes intensely furious when this is denied from him. This makes him commit acts that make him just as bad as his brother Henry. He also has an incessant habit of flaunting the smallest things he has done to his parents with the hope of receiving praise - the smallest things, from getting up in the morning to laying the table to polishing his shoes.