Joy Mercer was the person who tried to get Fabian Rutter and she was trouble to Fabina, but later she let them be back together. In Season 3, Joy says she still has a crush on Fabian and is a member of Sibuna until she quits in House of Pi / House of Mistrust. She is play by Klariza Clayton.
Joy is a nice girl (not when she's crushing on Fabian). In Season 1, she suddenly went missing.
Click here for the Joy Mercer's Gallery