Diddy has apparently been a Dr. Jekyll and Mr. Hyde character over the years — either a super nice guy, or allegedly violent and vicious … this according to a new bombshell report.

Rolling Stone just published a sprawling article about the embattled rap mogul — detailing his life story and rise to fame starting in the ’90s … now coinciding with his current federal criminal investigation, which could land Diddy behind bars for a long time.

During their 6-month investigation, RS reporters reached out to 300-plus people in Diddy’s world and interviewed over 50 former friends, acquaintances, employees, artists and industry insiders. Many of them refused to talk … but those who did had quite a bit to say.

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Several sources — including close associates of Diddy’s from his Bad Boy days — claimed to RS he has a dark side and could be a menacing figure … desperately seeking acceptance/ admiration while demanding public displays of devotion from others and splashy donations.

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The Rolling Stone piece details several instances of either alleged outright violence — or fits of rage … which the outlet reports goes all the way back to his days as a Howard U student.

One alleged anecdote details a time in which Diddy gets accused of pummeling a record label executive who started dating his ex — the late Kim Porter, whom he’s alleged of abusing in this piece. He’s also accused of not ever letting her really move on throughout what’s described as a tumultuous and toxic relationship.

Other women Diddy has dated are also mentioned in this story — including Jennifer Lopez, who RS reports was subjected to Bad Boy staffers trying to convey a message to her via Diddy after they split in an attempt to win her back. Apparently, Diddy sent these BB workers to ‘TRL’ studios to stand outside with signs … begging her to get back with Puffy at the time.

Not only that, but, according to RS, Diddy made sexual advances to his female employees and other female associates/acquaintances throughout his reign … one woman claims he’d approached her boss to solicit her for sex.

In yet another alleged instance, he’s accused of attacking a woman at Bad Boy’s offices — which required employees to bust in and tear him away from the woman.

There’s a lot more in this piece — including claims that Diddy was jealous of Tupac‘s relationship with Biggie Smalls … and that he wanted the spotlight after Biggie’s death. Several Bad Boy associates/employees/ are described as hating the dude behind his back.

Despite all these ugly episodes that are described in the article — there are positive sides of Diddy that are also touched on. Bottom line … Diddy allegedly runs really hot or really cold.

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Of course … the backdrop here is the fact that a grand jury has now been convened, and witnesses are being contacted to potentially testify ahead a possible indictment. Despite his mounting legal challenges, Diddy has denied most of the wrongdoing alleged against him.