if there was only one purpose, it would get boring.
That's not necessarily true. Consider Death Note. One overarching purpose givess a plot a strong core that binds everything together, I've noticed. GitS did that, sprinkling main plot episodes in between the stand-alones.
The way you're describing your story so far, it reminds me of Full Metal Panic. That had the rivalry between Sousuke and Gauron to link missions together. I don't remember the plots or individual missions very well, so it maybe that's a weak model. And, I know your story won't be exactly like FMP, I see differences already, but already I perceive that it'd have a similar feel.
Her mom thought about naming her Stormy, but in the end didn't.
Thank goodness.
