|Jonathan Vittorio Simpson-D'Amico|
|Relatives||Father: Michael D'Amico|
Mother: Lisa Simpson
Sister: Emelia Simpson-D'Amico
|Voiced By||Michael Cera|
Jonathan is the second-born child of Michael D'Amico and Lisa Simpson. He is named after Johnny Tightlips, an old mentor of his father and a longtime trusted caporegime of the D'Amico crime family. Much like the person he was named after, Jonathan is the least talkative of his siblings, but he takes after his mother when it comes to his love of science and his father for his interest in cars and cooking.