Saeko is... special, but you can't honestly blame her once you get to know her story.
As for the interacting storylines thing, some do while others don't. It's not something I explained before, don't worry xD
Shayla & Evelyn have interacting storylines. However, they have nothing to do with Hakuno and Saeko.
Hakuno herself is an OC made for a fanfiction, lol. Started off just as the MC's new identity, but things... scalated. Fast.
Then there's Saeko, whose origins are unnecesarily complicated. Long-story short: my friends and I started a new roleplay game, only the GM was like 'let's make this a crazy trip across the multiverse' and we went W I L D.
The only thing I was worried about was having been told something before but forgetting (because my memory is weird), so yay XD
I totally understand about things escalating fast XD I originally got onto my current batch of characters by redrawing some fan characters as humans (and then realising one of them was missing parts and adding wings, horns and tail to him "for no apparent reason" as I described it at the time but the real reason is I just have to do whatever these things tell me to XD) because an old friend told me that they were "too cool to be fan characters" after reading a scene I'd thrown in a forum for critique.
We all start somewhere(?) Also "too cool to be fan character" what an iconic line xDDDDD