Delia and Deidre Dennis, better known as the Dee Dee Twins, are twin sisters who first debuted in "Batman Beyond: Return of the Joker". They are the twin granddaughters of the infamous villain Harley Quinn, continuing her chaotic legacy in Neo-Gotham as part of the Jokerz gang.

== Appearance == Delia and Deidre Dennis are 18 years old. They stand at 5'6" (168 cm) and weigh approximately 120 lbs (54 kg) each.

They are identical twins with a striking visual design that blends retro fashion, circus aesthetics, and a splash of psychotic glamor. In their natural form, they have long blonde hair, blue eyes, and youthful, angular features. However, they are rarely seen outside their signature Jokerz costumes.

Their outfits consist of bright red Raggedy Ann–style wigs, white pillbox hats, red strapless tops, white shorts, and red go-go boots. Their faces are painted with exaggerated white clown makeup, reinforcing their eerie, doll-like presence.

== Personality == The Dee Dee Twins are playful, sadistic, and unnervingly in sync. They often speak in unison or finish each other’s sentences, adding to their uncanny presence. While they come across as ditzy or flirty, this is a well-honed act to disarm their targets.

In truth, both Delia and Deidre are highly intelligent and cunning—traits inherited from Harley Quinn, who was once a psychologist. They are strategic in their criminal activities, often using misdirection and coordinated attacks to gain the upper hand. Though they frequently argue in private, they never let personal conflicts interfere with their missions.

Despite their allegiance to the Jokerz, there are hints of internal conflict, particularly when they are separated or confronted with their family legacy. Their bond with their grandmother, Harley, remains strong, and she later helps them reform after their brush with justice.

== Trivia ==

• Two members of the Joker gang from the Batman '89 resemble Dee Dee. The two women also wear jumpers with "All this and brains" and "All this and brains two" written on them, references Lola Chong in Frank Miller's 1986 Dark Knight series and Prince's Batdance music video depiction of a brigade of identical Vicki Vales.
• It is unknown who the other grandparent of Dee Dee are. Some speculate it to be the Joker, given their appearances in the Jokerz gang. Their red hair might connect their heritage to Harley's other DCAU love-interest, Poison Ivy.
• Dee Dee is arguably the most competent or lethal of the Jokerz shown in the alternate timeline as they successfully killed not one but two superheroes (Kai-Ro and Terry McGinnis respectively) though these events were ultimately undone after the Justice League were able to defeat Chronos.
• Their coordination in combat is unnervingly perfect—they’ve been observed performing synchronized acrobatics, double-team attacks, and even completing complex tactical maneuvers without speaking.
• The twins were voiced by actress Melissa Joan Hart in Batman Beyond: Return of the Joker.
• According to early concept art, the Dee Dee Twins were inspired by classic creepy doll tropes and the twin girls from The Shining—a visual reference carried through their appearance and behavior.
• In the epilogue of Batman Beyond: Return of the Joker, it is revealed that both sisters were eventually released from juvenile detention and reformed, living with their “Nana Harley,” who now works as a law-abiding grandmother.