Neutral Special: Eruption
Ike lifts his sword and plunges it forwards. This attack can be charged. In fact, if timed extremely precisely, it can OHKO.
The attack is slower, but deals stronger damage. However, the OHKO is even harder to time right.
Side Special: Quick Draw
Ike dashes forwards with his sword. The attack can be charged to go a longer distance. It is also a good horizontal recovery.
The attack does more damage, but travels a lower distance.
Up Special: Aether
Ike throws his sword in the air. He then jumps to get it and falls down to the ground(or in a pit) quickly. While it can be used as a recovery, it is rather risky to use, as if Ike misses the ground he will likely fall to his death.
Ike launches his sword higher, but the attack deals less damage and he doesn't falls back to the ground.
Down Special: Counter
Ike strikes a pose. If hit by a melee attack, he will attack back the foe, dealing double damage the foe tryed to do to Ike. However, it is hard to time right, and leaves Ike vunerable after.
The counter is easier to time, but deals less damage.
Final Smash: Great Aether
Ike slashes. If an enemy is hit by the slash, both will go in the sky and Ike will slash the enemy several time before dealing a finishing blow to it.
The aether itself is weaker and will usually not KO below 25 damage, but dashes while he slashes.