The 24-year-old nobody who cops say gunned down the boss of the Gambino crime family was hauled into a New York City court for the first time Monday to face justice for the gangland slay.

Police slapped 24-year-old Anthony Comello with murder, assault and firearms charges following his extradition from New Jersey, where he was arrested after allegedly gunning down Gambino boss Francesco “Franky Boy” Cali in front of the Mafioso’s Staten Island home March 13.

Police believe Comello, a sporadically employed construction worker who lives with his parents on Staten Island, rubbed out Cali, 53, because the don didn’t want him dating his niece.

Comello confessed to the killing, but later shut his trap and lawyered up, sources have said.

Comello, who was hauled into a Staten Island criminal courtroom wearing green-and-white striped prison garb, did not enter a plea.

Law enforcement sources have said that Comello is himself a target for assassination since he was named as a suspect in the rubout of Cali, and his lawyer Robert Gottlieb requested Monday he be placed in protective custody.

The lawyer also asked that Comello be allowed to take prescribed medicine, which he was not able to take over the last week. The lawyer would not say what kind of medicine it is.

The MAGA-loving millennial has a history of erratic behavior, including running an unhinged pro-Trump Instagram and once trying to effect a citizen’s arrest on Mayor Bill de Blasio..

Defense lawyer Robert Gottlieb didn’t seek bail for Comello, but asked Criminal Court Judge Raja Rajeswari to ensure Comello would be held in protective custody and complained that he wasn’t receiving unspecified, “recently prescribed medication.”

Outside court, Gottlieb was asked about Comello’s court appearance in New Jersey last week, when he displayed “MAGA forever” written on his hand, along with references to the online “QAnon” theory about government forces conspiring to undermine President Trump.

“What was picked up by the media, that was real. That was what he wanted to express that day,” Gottlieb said.

Gottlieb also suggested that Comello’s mental state had been affected by things he read online.

“His family and friends recognized and picked up significant changes in him over the past few months. Something clearly went wrong,” Gottlieb said.

“It’s not just an attorney saying that, the people who know him — who love him — will be the source of that information, that something dramatically happened to him that certainly seems to have been affected by the hate that is spewed throughout the Internet.”