Rascal can conjure items. In Episode 6, Rascal conjured a "Little Earth" as a visual aid during his explanation of the villains' plan. He can use his cards to make them big, to defend, throw one card, to multiply into many, or to capture and teleport them or himself. In Episode 19, he is capable of fighting the Glitter Force using offense, defense, and counters, without an effort (include the purification attacks).
Like Ulric, Brute, and Brooha, he can use a piece of the Black Paint of Darkness, and can darken a blank page of his Picture Book of Darkness (symbolizes the brand new future). This changes the world into an evil alternate reality with a purple and black sky. In Episode 20 he finally summoned a Buffoon for the first time. In Episode 21, Rascal revived the dead commanders.
Rascal appears as the most human compared to his partners, with the exception of his long fingernails and sharp teeth; he wears a white half masque, hiding his eyes which appear as black slots, a white and violet bodysuit with a small violet cape. His hair is styled into the appearance of a traditional jesters hat, and is multicolored blue, red, yellow and violet. In Episode 32 when he shows his impatient and angered side, his face became more monster-like. Only he has red eyes and his teeth became fangs.
He is playful and clownish. As leader of the commanders, he orders them every time he appears. Vibrant as his clownish appearance, Joker tends to playfully break out in acrobatics and non sequiturs, but it is clear that his bouncy bearing belies a sadistic lover of destruction.
Rascal came across three pixies named Ricky, Rufus, and Margie, who were mistreated for being fairy tale villains, and gave them power, transforming them into Ulric, Brute, and Brooha, who would serve Nogo alongside him.
Rascal usually stayed in the shadows in Season 1, letting the trio gather negative energy and fight the Glitter Force, searching for the Miracle Jewel. He eventually gave them blue noses to create Buffoons that are immune to the Glitter Force's powers, but they were able to destroy them with a combined attack in Tiara Mode.
At the end of Season 1, he stole 15 of the Glitter Charms and kidnapped Candy, defeating the Glitter Force in Jubiland. He eventually came to the conclusion that Candy knew nothing about the Miracle Jewel, and fought Glitter Breeze, who defeated him, though he survived.
In Season 2, Rascal recovered Nogo's egg after he was sealed inside it by the Glitter Force, and seemed to be in contact with him, as he would often tell Ulric, Brute, and Brooha that Nogo was not happy with their failures. He also put together noses to make Super Buffoons, and later Twilight Buffoons. At one point, Rascal trapped the Glitter Force inside a dream ball, inside which was a dream world of all play and no work, but they eventually broke free of it.
After sending Ulric, Brute, and Brooha after individual members of the Glitter Force, to no avail, and mentioning that Nogo was losing his patience and is close to turning them back into pixies, Rascal had a rematch with Glitter Breeze, unusually summoning a Twilight Buffoon from a mirror (mirroring Chloe's first Buffoon enemy) that acted as a separate entity rather than a shell he would control, until he merged with it to duel Breeze. In the end, Breeze defeated him, and he separated from his Twilight Buffoon before the Glitter Force destroyed it.
Rascal gave Ulric, Brute, and Brooha one last chance and gave them a black nose which they used to transform into shadow versions of themselves, but Glitter Lucky purified them back into pixies, obtaining the last Glitter Charm, which Rascal then stole, having gathered enough negative energy to turn Nogo's Wheel of Doom the final time. Rascal created shadow clones of the Glitter Force and had them fight them each in a different dimension. With Candy seemingly revealed as the Miracle Jewel, Rascal revealed that he and Nogo wanted the Miracle Jewel not to make a wish on it, but to destroy it and plunge the world into despair. Upon realizing that Candy was Queen Euphoria's daughter, and that she had been placed inside the crystal to protect her, Rascal instead drained all the energy from Earth. When the Glitter Force defeated the Shadow Glitter Force and returned to Earth, Rascal sacrificed himself to complete Nogo's revival, melting into a puddle of black paint which was then absorbed by Nogo.
- Rascal has two main voice actors: Keith Silverstein (English) and Yuji Mitsuya (Japanese).