We've been celebrating a lot of character anniversaries lately — Batman, Catwoman, Wonder Woman — all 75 years old or more. But today, which is officially Batman Day, DC is celebrating the 25th anniversary of Harley Quinn, a character that was created by Paul Dini and Bruce Timm for an episode of Batman: The Animated Series (which is also celebrating its 25th anniversary) as just a henchwoman for the Joker.
Harley was supposed to be a one-off character, but between Timm's classic design and the chemistry between her and the Joker she quickly became a favorite of the show's writers. She then made the jump to comics and has built up to being one of the most loved and recognized characters in the industry.
She made her live-action feature film debut in last summers Suicide Squad as played by Margot Robbie who is expected to reprise the role in upcoming Gotham Sirens and or other Warner Bros. films.
The video features a foreword by co-creator Timm talking about the character. They then through her 25 years of history, from her first television appearance to getting her own comic series and all the various versions of her costumes. It's interesting in that her costume stayed pretty consistent up through 2010, and then with the New 52, all bets were off. Personally, I will always be a fan of the original.