little stuff about formation:
a squadron of 6 divided into 2 groups, 1 frontliner and 1 backliner. Frontline is easier to be targetted by enemies and engage first, they will get +5% dodge bonus and ideally you want to put 回避型 (dodge type) or 機動型 (maneuver type) pilots in front. Backline has more space to support and attack enemies and they will get 5% attack bonus, best to place 攻撃型 (attack type), 補助型 (support type), and 機動型.
still don't know about the arrow besides their type, see if anyone could explain?
also colours doesnt seem to have any effect against each other like elements but it's just for bonus at certain stage.