Much like Barry Goldberg, Johnny seems to have an oddly high opinion of himself. He is a huge fan of the band Rush, and can almost always be seen wearing a t-shirt from one of their tours. He has a ponytail and loves playing the saxophone, so much so that he apparently carries one around with him, and also plays the drums.
Johnny first appears in Season 3 and attends William Penn Academy. He seems to have been held back a few times as Adam mentions in Season 7 that Johnny is starting his "third senior year".