Stuff I did to beat story mode:
Played for 3 days straight.
I have finally completed the damn game.
Chrono: Alternate between jenga and snipe.
Vita: Giant Iron ball and homing balls are your best friend (and if they don't have super armor, gigant or rakaten when you see the whites of their eyes).
Kyrie: Rapid fire and finest cannon (same with Amitie).
Nanoha: axel shooter and divine buster.
Reinforce: just use hibiki or whatever that violet beam is. Or spam the bind when the opponent stops to attack. Also used balls+hibiki.
Hayate: alternate between long and short charges xD. Also used swords.
Fate/Levi: Guard+Full Drive and Sonic Form. Then attack from Long Range. Spark and Slash.
Einhart: simply spammed reflect projectiles.
Vivio: spammed bullets like crazy. Or beat opponent up in melee.
Stern: same as Nanoha except Pyro and Blast Heat.
Dearche: arondight. Or spam basic ranged projectile like a machine gun.
Signum: KILL IT WITH FIRE. (slash sometimes).
Zafira: kick kick kick (circle or D).
Twins: jenga (to hell). And try getting FD in.
Shamal: ......... Just try to lure to shield. I had problems using her.
Touma: silver cannon, most of the time.
Yuuno: .... Shield charge (lol wtf is a Crusader skill from RO doing here...) and run.
Long range is ones best friend to opponents you can't handle
FULL DRIVE ASAP (except vs UD) <- cant be blamed cause I did it and it worked.... 70% of the time, one has to note the speed of the full drive, including range. Or just dash crazy around the opponent until he has opened himself to attack.
btw is it possible to compile all of the OST is Gears of Destiny?