Jasmine "Jazz" Fenton is the older sister of Danny Fenton, and his clone Danielle. She is determined, highly intelligent, and unafraid to express her criticisms without sugar coating it. At times, she can be vengeful, particularly when her siblings or innocent people are insulted or harmed. She has a bit of sass in her as she can be scornful if the situation calls for it. While she may not excel at feigning ignorance to deceive others, she somehow still manages to succeed at it.