[@Feyblue]
Having reread your character writeup, I do agree that the backstories are uncomfortably similar, although the girls have responded in very different ways. I have made a few changes to Koharu's, although I think that it would be interesting to have them be mirror images of each other. I think a lot of it would be emphasis - Koharu is really mostly alone in the world aside from her friends, so her work is very much a matter of supporting herself, whereas for Suzuka it's more about a family obligation; Koharu rents from a landlord (and I've switched from a whole apartment to a room in a share house), while Suzuka is living above her aunt's cafe. Fundamentally, Koharu's position is significantly more precarious than Suzuka's and I think that will come out during play.

That having been said, I think Koharu could work at a variety of jobs, going through them with the seasons and as availability allows: cleaning, delivery, konbini, izakaya, packing, beer seller at the ballpark, whatever. It could even be a bit of a schtick - "Where's Koharu working this week?"

I don't think they'd become enemies though: for one thing Koharu isn't the sort to have enemies, she tries to get along with everyone even if she does step on a lot of toes along the way. Might be that Suzuka doesn't like her very much, but Koharu will still repeatedly and cheerfully get in her space until the ice thaws.