Handjob girl in Area 1, Free anal girl in Area 1, Drug-resistant mermaid in Area 1 (Screw it, I loved all the mermaids except the pink super saiyan one), Great Fairy in Area 2, Jennie's sister in Area 3.

It would be cool to add the currently non harem-able girls as perhaps milestone features? Like let us redo areas with the energy we have wasting, even if we don't get any xp from it. Instead perhaps get a girl for certain clear amount milestones. Not sure how hard it is for you guys to create new character images and scenes to add them to the harem though.