Blogiversity.org

Samus hails from the Metroid series. She is a futuristic bounty hunter with an arm mounted cannon and some incredible armor. She has good agility, and a powerful arsenal of long ranged attacks. Her biggest downside is her weak close combat abilities. She is a heavier class fighter and can take a real beating before going down.

Standard Special Move: Charge Shot

Her main weapon is the cannon mounted in her right arm. Tapping the B button will unleash a stream of tiny energy balls that can damage and interrupt your enemy. Holding down this button will start her charging a bigger energy ball. You can fire at any time to unleash the blast, or shield to hold the charge at whatever level it currently stands at. If you let it charge to its max, it will stand by at maximum power until you fire it. You can tell your gun is fully charged because it will flash with a tiny blue light. Tapping the button again will unleash the blast.

Side Special Move: Missile Launcher

Samus packs an endless arsenal of missiles to compliment her energy cannon. Holding down a direction and tapping B will fire a heat seeker missile in that direction. It will follow your opponents for a short distance and explode on contact. She can also fire a more powerful Super Missile that will travel quickly in a straight line.

Down Special Move: Bomb

Samus can roll into a tiny ball and drop round bombs that will roll on the ground for a few seconds. This can give you the upper hand when someone is waiting under you to juggle you in the air. You can also scatter bombs on the ground when you just need someone to back off and give you some breathing room.

Up Special Move: Screw Attack

This move functions as an attack and a recovery move. Pressing up and B will cause you to vault into a somersault with a boost from your rockets. You will spin quickly and create an energy field around you that damages any opponents you touch. It is a good way to get back on the edge when someone is waiting for you.

Grapple Beam:
 

Samus also has an energy beam that can be used as a grappling hook. Pressing R on the ground will emit this beam sideways, grab your opponent, and pull them towards you. You can also use this in mid air to do a little damage to your opponent. You can also use it to grab onto a ledge and pull yourself to it. This takes a lot of practice and it's a dangerous technique, but it looks really cool when you pull it off.