A bit of a mixture! We do votes on our Patreon every so often, and there are options to increase duo scenes or individual scenes with older employees. Right now, Romance keeps winning the poll (those are the scenes you do in chapter 2 when the tower breaks down). We've only finished two characters, but after the next update (new character) We'll be finishing Xun the Dryad and Cass the punk.
So stuff does get added for older characters, but usually in smaller bites.