The vagrant who allegedly bludgeoned four sleeping homeless men to death in a pre-dawn Chinatown rampage Saturday calls himself the “tranquil” type on Facebook — but warns that he doesn’t play games.

“Yo soy un tipo trankilo,” suspect Rodriguez “Randy” Santos, 24, wrote on one of his three Facebook pages. But “no hay juego,” he added.

And in between tributes to Dominican rap music, and a profile video in which he appears to smoke a joint, he also offers a tribute to late evangelist Rev. Billy Graham.

As his profile picture on one account, he used a photo of a Spanish translation of Graham’s book “The Key to Personal Peace.”

His accounts list him as living in the Bronx, with connections to the Dominican Republic.

“He has a temper, but he is a good person,” said Mayra Santos, a childhood friend from the Dominican Republic. Santos used to visit her and her grandmother in the city of La Vega, but she hadn’t heard from him recently, she said.

At many points, Santos’ online posts devolve into near gibberish.

A stock photo posted in April has the caption: “loneliness kills,” also in Spanish.

Santos, who police said is homeless, was being held Saturday night at Manhattan’s Fifth Precinct, where he was facing murder and assault charges in what police called a random attack that left a fifth homeless man in critical condition, police said.

The unhinged maniac has 14 past arrests — four of them in the past year, a law enforcement source said.

He was busted in November 2018 for biting a man’s chest during a savage assault at a Midtown store, the high-ranking source said.

Santos’ last known address is a men’s shelter in Brooklyn, where he was arrested for attacking another man in May — with a metal object similar to Saturday’s weapon, according to sources.

He was also busted last March for groping a 19-year-old woman in Queens, the source said.