Joyce is The daughter of Holly Joestar and big sister of Jotaro Kujo. She is a bright woman in her 20's, Smart and cheerful ready to help but secrertly suffers from her stand and PTSD. She is a doctor and Scientist at Speedwagon Foundation and joins the Stardust Crusaders to save her mom. Her stand is Amber Ace which has healing properties with a Amber like resin that heals and has enhanced audition but if not handled well can cause insanity. Amber ACE requires concentration to work.