Akuma

How Akuma joined the Tourney
During the events of Seth's tournament, he continues his training, and senses the Satsui no Hadou reemerging within Ryu. Immediately, he sets off to find Ryu and help him realize this power so he can try to kill him in battle. Like the other tournaments, Akuma does not officially enter, but stays in the shadows. Eventually, he finds an unconscious Ryu in the care of his brother Gouken. Akuma noticed that his brother has perfected the Mu No Ken (Empty Fist). The two brothers fought, with Ryu being the prize. Both survived their fight, and Ryu was saved by Gouken. Akuma continued his training and his search for a worthy opponent to match his own, especially in the newly announced Smash Bros. Tourney.

Gohadoken (Neutral)
Akuma fires a purple energy ball.

Tatsumaki Zankukyaku (Side)
Akuma performs a hurricane kick.

Hyakkishu (Up)
Akuma leaps forward, high into the air. Useful for recoveries.

Ashura Senkuu (Down)
Akuma widens his stance, glows red, then lifts one knee and "glides" forwards along the ground to another location with his eyes aglow.

Raging Demon (Hyper Smash)
Based on his Street Fighter IV Super Combo, Akuma poses and then warps via Ashura Senkuu towards the opponent to grab them. The screen flashes with light and violent strikes are seen "as the might of the 16 hells bombard the foe" while the screen is blacked out. Akuma and the opponent will then reappear, with the opponent sent flying as he says "I still have more!".

Wrath of the Raging Demon (Final Smash #1)
Based on his Street Fighter IV Ultra Combo, Akuma tells the fighter "Prepare yourself!" and when he connects, four kanji appear randomly on the screen, and he says "DIE ONE-THOUSAND DEATHS!", after which Akuma proceeds with the attack, and the opponent screams in pain, in the same manner as if they were sent through a Star K.O. The opponent is then sent flying as Akuma says "You have a LONG WAY TO GO!". Break a Gold Smash Ball, then activate it by pressing the Neutral special button.

Demon Armageddon (Final Smash #2)
Based on his second Super Street Fighter IV Ultra Combo, Akuma yells "Accept DEATH!" and kicks the opponent in the air, and follows them with an extremely powerful Hurricane Kick which envelops him in a whirlwind. As he hits his opponent, his 'Kanji' appears in the background; he then forcefully rushes past them, just as the Kanji shatters into pieces, after which Akuma says "The other realm awaits...", which is followed by his opponent's Star K.O. scream.

Victory Animations

 * Standard #1: Akuma performs his second victory animation from Street Fighter IV and says "Both heaven and Earth tremble before my might!".
 * Standard #2: Akuma performs his first victory animation from Street Fighter IV and says "Death's too good for you!!!".
 * Standard #3: Akuma performs his fourth victory animation from Street Fighter IV and says "Your toys WILL NOT DEFEAT ME!". He says "Shameful!" in Street Fighter IV.

Trivia

 * Akuma is voiced by Dave Mallow and Taketora in English and Japanese, respectively. Coincidentally, those were his voice actors in Street Fighter IV.