Andrew - First of all, his red hair screams pedophile. It's not naturally red, mind you. It is permanently stained the color of when his victims rip apart. Let's move on to the glasses. The strain on his eyes comes from up-close anal investigation, pre-rape of his victims. His trapezoid mouth has permanently been shaped to optimize the suction in creating many a hickey upon the cheeks of his victims. And the shape of his head indicates he was a vagina baby, as opposed to a C-section, which puts him at greater risk of being obsessed with orifices.
Kyle - Has a young boy innocence about him that allows him to get close to and befriend his victims. Not to mention, his large, protruding jug ears, which we all know is a classic sign of a pedophile. And like Andrew, the pedo wears classes from eye strain in anal investigation.
Ahmed.
David - No one else but a pedophile would always wear sunglasses in the shade, have wardrobe malfunction such as a tie the same color of his suit, and always have his hands in his pockets. The bend of his knees suggest he has a "one foot after another" sort of walk, or in other words, an awkward and deliberate pacing, only suited for the top rank pedophiles. Side note - David, out of the four pedophiles I shank, was the only one who asked to jerk off one last time before he died. After the murder, I found a babies binky in his pocket, implying his arrested development and obsession with kids in that stage of life.