If there is one character on "American Dad!" who is as unhinged and violent as Roger, it has to be Principal Brian Lewis, the head of Steve's school. Before becoming the principal (a job he is wildly unsuitable for), Lewis was a successful career criminal. It is a chapter of his life that Lewis looks back on with a great deal of fondness. 

Back then, Lewis gleefully indulged in every form of hedonistic gratification that crime had to offer, including females. It was the age of the females that was a particular cause for concern. In "You Debt Your Life" (Season 6, Episode 12), Lewis remarks thusly about his former crime boss: "Machado was a cold bastard but he was good to his men. Once you drew blood for him you were set. Hooch, blow, girls — not women, GIRLS, little bitty things ..."  

The implication is clear: Lewis has slept with underage girls in the past. Even worse, he is occasionally seen lusting after the female students who attend his school. Considering how happy Lewis always is to fall back on his old ways, one can't help but wonder how safe the teen girls at Steve's school really are.