Danny wasn’t the only Fenton that had been affected by ectoplasm exposure.
Jazz showed her powers for the first time when she was 3. Jazz had set the curtains to her room on fire. She blamed it on Danny after the fire was out. Jack believed her.
When Jazz was five, she discovered what she called ‘firebending’ after a show that she had watched on television. But she hid it, because she didn’t want her parents to think she was weird. After all, she was the only one in her family that had powers.
When Jazz was six and Danny was four, she discovered Danny’s ice powers. Now she knew two things. She wasn’t the only weird one, and her parents had no idea. How did they not notice that their kids had powers?
Danny and Jazz grew up keeping their powers a secret. In a world of meta human trafficking, ghosts, and aliens, they didn’t want to get involved in it.
The portal started up for the first time when Jazz was 13 and Danny 11. It started up shortly after their parents old college friend came back into their lives. Vlad paid the kids very little attention. They practically didn’t exist to them.
Jazz and Danny met Batman for the first time when she was 14. Batman and his crew had come to raid their home on the basis that it was a base for the supervillain, Plasmius. Jazz took Danny by the hand and they kept back Batman’s crew with a mixture of fire and ice, and disappeared without a trace.
Two years after that, when Jazz was 16 and Danny was 14, the two orphans remerged in Star City. They had gotten caught by Green Arrow and John Constantine, and they were very, very angry about it. They don’t want to be science experiments. They don’t want to be heroes. They just want to live their life.