^ Here's some tips from me
(Nero)
M = Melee attack
Combo A: M, M, M, M. A standard four-slash attack that will hit multiple enemies if they're close together.
Combo B: M, pause, M, tap M. If you pause after the first swing, Nero will start smashing his sword against the floor.
Combo C: M, M, pause, tap M. A combo that will slash at multiple enemies around Nero.
Combo D: M, M, M, pause, M. Same with Combo A. A few slices and then a powerful finishing move.
Calibur: While in midair, hold lockon, backwards and then forwards, and hit M. This will cause Nero to fly through the air towards his opponent and deliver a sword attack.
Shuffle: While on the ground, hold lockon, backwards and then forwards, and hit M. You will dash backwards, away from your foe, then move forward again to counterattack.