Harley Quinn. The latter remains a phenomenon that's led to a countless number of cosplays and a seemingly continuously growing following

RELATED: Birds of Prey May Rewrite Harley Quinn's Suicide Squad Story

Now that the teaser has been unleashed, it's official, Robbie's Harley Quinn is back. But it's been a while since she rocked her short shorts and "Daddy's Lil Monster" shirt. Don't worry though, you're covered. Here's everything you need to know about Suicide Squad's Harley Quinn.

Harley Is A Millennial

Margot Robbie Harley Quinn Suicide Squad

That's right! The Queen of Gotham is a millennial in Suicide Squad.

Born on June 20, 1990, Robbie's Harley Quinn was supposed to be 26 years old in this movie. Some other vital stats include being born in Gotham, New Jersey and 5-foot-8. She was also a gymnast in high school!

She Went To Gotham City University

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Harley may be insane, but she's no dummy. Quite the opposite. That's how she landed a full ride to Gotham City University, where she studied psychiatry under Dr. Odin Markus.

In her thesis, Harley's focus was on the fact "there are two circumstances under which a person disregards rules of society: when they commit a crime, or when they're in love." It seems she really took that to heart!

She Was Interning At Arkham When She Met The Joker

Margot Robbie as Harley Quinn and Jared Leto as The Joker in Suicide Squad

Although she had earned the title of "doctor" by the time she started her tenure at Arkham Asylum, Dr. Harleen Quinzel was still a "psychiatry intern." She may have been a promising student and bright young mind, but it might have been in her best interest, and everyone elses, if there had been a supervisor with her when she worked with the Joker.

Intern or not, it seems like a really, really bad idea to stick a 20-something-year-old in the room with the most dangerous person in the world, no matter how smart that person may seem.

Harley Wore Her Original Outfit

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Yep, Harley rocked the outfit she was known for in Batman: The Animated Series.

That was another thing they got right with the movie. They had to show respect for the old outfit, but they couldn't have her wear that thing anymore. She broke that thing out in 1992. They may be rebooting shows from the 90s and early 2000s, but some of their fashion is better off staying in the past.

She Can't Swim

Suicide Squad Trailer Harley Quinn Origin Chemical

Fairly early in the film, it's revealed Harley Quinn can't swim—yet, she still tried to kill Batman when he went to save her. But that's not even the weirdest part. In a flashback, Harley thinks back to the moment where she deliberately fell headfirst into a tub of chemicals. And it was a long fall, too. All for "Mistah J."

If that isn't love, what is?

She Has Hallucinations

Suicide Squad Trailer - Harley Quinn Cage

Harley has more than one voice chattering in her head. At the camp outside Midway City, she mentions how the voices are telling her to do something along the lines of killing everyone. Furthermore, she double-checked everyone was on the same page when they finally got to Enchantress. She said she was off her meds and thought she was seeing things.

She's Fashionable

Will Smith as Deadshot and Margot Robbie as Harley Quinn in Suicide Squad

Harley didn't only update her outfit from that dated look that goes perfectly with the Red Queen's Army in Alice in Wonderland. She also picked up a very cute purse at the Paris Ready in Midway City. She also likes to wear wristwatches on her upper arms. Apparently, that's a thing?

She has her "PUDDIN" necklace she dawns throughout most of the movie, but she also had a fancier, but subtle one that says "Joker."

Harley Likes Her Tattoos

Margot Robbie smiles in a car as Harley Quinn in Suicide Squad

Throughout her screentime, Harley shows off 13 tattoos. Yeah, that's right, she is all inked up. Her tats range from a small heart to "Daddy's Lil Monster"—and she is not shy about putting them on display.

She Stood Up To The Joker

Suicide Squad Joker Harley Quinn Set Photo

In the extended cut of Suicide Squad, the Joker rejects Harley after breaking out of Arkham Asylum. However, she didn't take no for an answer. That gave us a sick bike scene, her shooting a trucker in the face and most notably, her giving the Joker the business. It's a pretty sweet scene and worth checking out. After watching it, you might wonder, "why'd they cut this?"

Harley Annoyed The Rest Of The Suicide Squad

Harley Quinn Diablo Suicide Squad header

Another portion of Suicide Squad that was cut was Harley's psychoanalysis of her "teammates." She tries to dig real, real deep on them too, despite operating on the fly. Deadshot had to shut her up because she ticked everyone off in the process. She did it because she was bored. which is a totally normal thing to do.

People weren't overly happy to see her after Joker's plane crashed either. They didn't necessarily want her dead, but you can bet at least Captain Boomerang and Deadshot wanted a ride out, too.