Harley Quinn, also known as Dr. Harleen Frances Quinzel, PhD, is a fictional character in American comic books published by DC Comics. Created by Paul Dini and Bruce Timm for Batman: The Animated Series, she first appeared in its 22nd episode, "Joker's Favor," on September 11, 1992. Initially intended for a single episode, Quinn's popularity led to her becoming a recurring character in the DC Animated Universe. Her origin story portrays her as a former psychologist at Gotham City's Arkham Asylum, manipulated by and falling in love with the Joker, ultimately becoming his accomplice and lover. Quinn's character has evolved from a sidekick and lover of the Joker to an independent supervillain and antihero. Known for her expert gymnastic skills, proficiency in weapons and hand-to-hand combat, unpredictability, immunity to toxins, and enhanced strength, agility, and durability, she often wields clown-themed gag weapons and has a pair of pet hyenas. Harley Quinn has become one of DC Comics' most popular and profitable characters, featuring in comics, media, and merchandise.Her character's voice has been portrayed by various actresses, including Arleen Sorkin, Tara Strong, Hynden Walch, Laura Bailey, Jenny Slate, Melissa Rauch, Laura Post, and Kaley Cuoco. In live-action media, she has been portrayed by Mia Sara, Margot Robbie, and Lady Gaga. Harley Quinn's creation

Harley Bird, also known as Harley Fiona Riley, is an English actress famous for her role as the voice of Peppa Pig from 2007 to 2020. Born on December 13, 2001, in Rochdale, Greater Manchester, she attended Tring Park School for the Performing Arts before graduating from the Manchester School of Theatre in 2023. Harley's career took off when she was signed to Alphabet Kidz Talent Agency at the age of five and landed the iconic voice role of Peppa Pig shortly after. In 2011, she became the youngest British Academy Film Award winner for her outstanding voice-artist work. Apart from her notable role as Peppa, she has also appeared in various TV shows and films, including "Blueberry" and "How I Live Now." In 2024, she starred in the Amy Winehouse biopic "Back to Black" as Juliette Ashby. Despite leaving the role of Peppa Pig in 2020, Harley Bird continues to make waves in the entertainment industry with her talent and versatility.

Harley Francis Flanagan, born on March 8, 1967, is an American musician known for founding the hardcore punk band the Cro-Mags. He started his music career at the age of 11, drumming for the New York punk band the Stimulators. Flanagan has been a prominent figure in the New York hardcore scene, playing a pivotal role in the formation of bands like the Cro-Mags and Murphy's Law. In addition to his musical endeavors, Flanagan is also a published author, with his autobiography "Hard-Core: Life of My Own" gaining significant popularity and acclaim. He has also ventured into solo recordings, including the "Dr. Know EP" and "The Original Cro-Mags Demos, 1982/83." Flanagan's personal life reflects his diverse interests and achievements, as he is a black-belt in Brazilian jiu-jitsu, a vegetarian since 1982, and a dedicated family man. Notably, Flanagan has also been involved in legal disputes, including a lawsuit over the Cro-Mags band name, which he ultimately won in 2019. With a prolific discography spanning across various bands and solo work, Flanagan continues to leave a lasting impact on the punk and hardcore music scenes.

Harley Jane Kozak is a multi-talented American actress and accomplished author. She gained recognition for her performance in the slasher film "The House on Sorority Row" and her recurring role as Mary Duvall on the soap opera "Santa Barbara." Kozak's acting career includes notable roles in films such as "Clean and Sober," "When Harry Met Sally...," "Parenthood," and "Arachnophobia." In addition to her successful acting career, Kozak transitioned to writing and has published five mystery novels, with her debut novel "Dating Dead Men" earning her esteemed Agatha, Anthony, and Macavity Awards. Raised on a farm in Nebraska, Kozak attended the University of Nebraska before pursuing acting in New York City. She later attended New York University's Graduate Acting Program, where she honed her craft and graduated in 1980. Kozak's personal life includes residing in Los Angeles, California, and being a mother of three. With a diverse career spanning both acting and writing, Harley Jane Kozak continues to captivate audiences with her creativity and talent.

Harley Jarvis Earl (November 22, 1893 – April 10, 1969) was an influential American automotive designer and business executive. He made history as the first top executive ever appointed in the design department of a major American corporation, General Motors. Earl was a pioneer in transportation design, known for his innovative approaches, such as freeform sketching, hand sculpted clay models, and the introduction of the "concept car." His notable design, the Buick Y-Job, is recognized as the motor industry's first concept car. Additionally, he played a significant role in the development of the Chevrolet Corvette through "Project Opel" and authorized the introduction of the tailfin to automotive styling. Harley Earl's impact extended beyond the automotive world. During World War II, he contributed to the Allies' research and development program in advancing the effectiveness of camouflage. His visionary ideas and influence on automobile design and marketing strategies, such as "Dynamic Obsolescence" and the "Annual Model Change," have had a lasting impact on the industry. Earl's legacy continues to influence automotive design and consumer perception, making him a pivotal figure in American industrial design history.