I'm not 100% on how the romance will work, as I don't enjoy the harem "oh, everone is fine dating you" trope but I can see why, from a player standpoint, it'd feel annoying to have to do x amount of re-plays for every character if the romance was choice exclusive.
I'm going to have to think on it, but I'm definitely wanting at least one person to be chosen to be a "partner" of sorts later, but that may become business partner over romantic. We'll see.
On characters, I plan for quite a lot and don't want to commit to any specific numbers. Every female character currently in the game will be recruitable eventually, and I plan for more across various social classes, hence the tabs in the contacts page. City, University, and Elite family members.