In the comics, Anissa Piece is the superheroine Thunder. Against her parents' wishes, she chose to follow in her father's footsteps fighting crime, though only after she graduated from college. Just like Black Lightning, she joined the Outsiders too, and during that time, became romantically involved with her teammate Grace Choi.
This is her third animated appearance. She previously appeared in the Thunder and Lightning shorts of the DC Nation Shorts and DC Super Hero Girls.