Crackle is Princess Vivian's pet dragon (the one rumor about Vivian that was true). She is voiced by Ellie Kemper.
Unlike her quiet and reserved owner, Crackle is loud and outgoing, and breathes fire when excited. She is a bit too protective of Clover.
She became acquainted with Clover while Sofia and Vivian worked on their class project in "The Shy Princess", but Clover did not like her at first because of her fire breath and was afraid she would set him on fire. But the next time he and Sofia came to visit, Crackle had set up a picnic of shish-kebabs for the two of them and used her fire breath to roast the food, which made it tastier, and Clover decided that maybe Crackle wasn't so bad after all.
In "Blue Ribbon Bunny", Crackle is shown to possibly have a crush on Clover, since she showed jealousy towards Ginger when she praised Clover, and got in her way when she was trying to get Clover's attention during the parade.
In "Finding Clover", Crackle showed up in Enchancia just to see Clover. When Sofia tells her that he's run away, Crackle goes with her to find him. She even breathed fire on Boswell's foot just to save him!