We've seen old lady Harley. How about Harley meets ;
Breaking glass, White Knight Harley (and Riot), BTAS, Margot, Birds of Prey TV version, Injustice, Arkham, Brave and the Bold flapper, 2006 the Batman, Thrillkiller
Others? Maybe some new versions such as Arlechino the harlequin, lover of Pagliacci the tragic clown..