I suppose I should also say that eventually my fic will deviate from canon. As I ramp up their interactions, I will eventually have them 'grown up', and in doing so their characterization would change.
Houki becomes nicer, and more 'Idol-like'.
Rin gets more reliable.
Cecilia gains true strength.
Charlotte reverses the Yandere Infection.
Laura becomes a proper commander and masters
Dengeki Tsukai.
I'll keep Ichika as a baka for now, but I will try to make him more likeable eventually.