Okay, I assume the woman in green and purple is connected to the Joker, but I can't get any clues from the others' outfits.
Gotham Knights follows the story of Bruce Wayne's adopted son Turner Hayes (Oscar Morgan), who is framed for Batman's murder alongside multiple children of the Dark Knight's foes
Morgan (Masters of the Air) will play Turner Hayes, whom Bruce Wayne adopted following the murder of Turner’s biological parents. Resilient and determined to live up to his adoptive father’s name, Turner has never felt comfortable in Bruce’s world of wealth and privilege.
Keegan (Days of Our Lives, High School Musical: The Musical: The Series) plays Duela, the unpredictable daughter of the most dangerous man in Gotham. Born in Arkham Asylum and above all a survivor, Duela is also a brutal fighter and skilled thief.
Robinson (Raven’s Home) will play Carrie Kelley, an idealistic teenager who talked her way into being Batman’s unlikely sidekick. She’s the first to rush in to a dangerous situation, so long as she can make it home by curfew.