Maria and Fayt were my favourites, though Fayt loses his usefulness post-game. Maria is the best character to use post-game because Energy Burst is unmatched in damage when canceled to 200% while everyone else's ultimate skills lack in comparison, and the only thing that's needed to assist this is Thunder Flare to hit-lock. Nel is great to use to kill in 4D mode if you have Full Active Mode and cancel Whirlwind to 200% because it generates its own juggling and hit-lock.