Alright, I have the Strategy guide, and though Legolas and Aragorn have their special moves, not everyone has one like they do. Nobody else has a HOLD AND PRESS combination, but they all have their perks
Legolas - Hold X and Press A - Shield Ride
Aragorn - Hold B and Press X - Powers of the Undead (healing over time)
Lurtz - Arrows Can Pierce through enemies and hit others
Gandalf - Lightning attack hits multiple enemies, even when not powered up. Fire attack is wide. Powerful against Multipe Enemies
Saruman - Lightning attack does a lot of damage to single enemies, powerful fire attack. Good against Single Enemies
Mouth of Saruman - Lightning attack is Weak on first target, but becomes increasingly powerful for each target it spreads to. Use against group for maximum damage!
Eowyn - When using Melee attack, jump to make Eowyn to a front flip over enemies. She is invincible during the flip, which can be used multiple times.
Frodo - Does not uncloak when using melee attacks
Wormtounge - Pressing LB + X puts a bomb in his hand. When holding this bomb, he is faster and stronger, and his energy comes back faster. After 10 seconds, the bomb explodes, doing a lot of damage to enemies, and a little bit to himself.
Elrond - Water Sphere Heals & Protects from projectiles.
Faramir - Energy attacks can be "mashed" for many hits
Gimli - Longbeard Pound attack is most powerful energy attack in game. It cannot be interrupted.
Isildur - Energy attacks are made more powerful by flaming "ghosts" that deal extra damage
Nazgul - Power of Nine attack can be comboed with other Energy attacks
Witch King - Terror Quake attack can damage an entire battlefield of enemies.