Lucario

"Behold... the Aura."

- Lucario

Lucario is a playable character in Super Smash Bros. Brawl, entering from the Pokémon series 4th Generation of games. He uses his Aura abilities for his many attacks, and is very quick and agile. Lucario can stick to walls. Lucario at some point in the game appears to fight Meta Knight at one point in the story. Afterwards, Lucario and Meta Knight team up. They later board the Halberd, and team up with Snake.

Lucario has a special property no one else in Brawl has - the more damaged Lucario is, the more damage and knockback all his attacks do. It seems to max out at 200% damage. A move that normally does 15% damage raises to 26% damage when he is at 200%, and knocks the opponent back about twice as far as normal.

Lucario seems to speak during the fight, for instance, during his Final Smash, but Sakurai has stated that Lucario is not actually speaking, but is using telepathy to communicate the voices.

Snake Codec conversation

 * Mei Ling: You're fighting Lucario, aren't you, Snake?
 * Snake: Mei Ling, what's that purple fire coming out of his hands?
 * Mei Ling: That's his "Aura."
 * Snake: Aura?
 * Mei Ling: I guess you could call it his life force. Lucario can use his own Aura and turn it into power. Every time Lucario's damage increases, his Aura gains strength, making his attacks more powerful. So don't think you've got him beat just because his health is down.
 * Snake: The cornered rat will bite the cat... Sounds like trouble.
 * Mei Ling: Hey! When did you become so good with proverbs?!
 * Snake: You must have rubbed off on me.
 * Mei Ling: Well, come back in one piece, and I'll teach you all the Chinese proverbs you can handle.

Lucario
''An Aura Pokémon. It can track energy called Aura, which is given off by all living creatures. It's a unique combination of both Fighting- and Steel-type Pokémon. Lucario evolves from Riolu during the day if its happiness has reached a certain point. It specializes in attacks that use Aura energy, like Dark Pulse and a can't-miss technique, Aura Sphere.''

Aura Storm
''Lucario's Final Smash. After flying off the screen, Lucario reappears in its center. He then launches a powerful Aura attack against all foes within a certain distance. The key to this attack is the ability to change its angle--it's a must to sweep slowly left and right to hit selected enemies multiple times. The last blow will send the victim flying away.''

Trivia

 * Lucario is the first Fighting type Pokemon to be a playable character in the Super Smash Bros. series. He is also the first playable Steel type.
 * Lucario is based on the Egyptian god Anubis.