Here the 16 persons who sign a contract with and they in the harem
Saber
Erza
Diane
Mimosa
Yoruichi
Mereoleona
Konan
Derieri
Fremy Speeddraw
Morglana
Shigure Kosaka
Aishela
Tio Klarus
Uzaki Hitomi
leone
Yasaka
And each girls have the crest on there chest
Like this
And also l will add my girls have Izuku crest in the future chapter