Oni

"I shall grind beneath my heel, all that exists."

- Oni in SSF4:AE

Oni (鬼, Devil), also known as The Mad Demon (狂オシキ鬼, Kuruoshiki Oni) is a secret fighter in the Street Fighter series. He can be fought as a secret boss in Arcade Mode, as well as being a playable character. Oni is in fact, Akuma who has let the Satsui no Hadou fully engulf and consume him to the point where he has fully discarded all of humanity and has lost his prominent moral code as a warrior who will now kill anyone in a fight, and has taken the form of a full demon.

''Note: This character should not be mistaken as Shin Akuma, even though both have very close similarities to each other. ''

Appearance
Oni appears as a far more muscular and slightly larger version of Akuma. He has dark blue skin, glowing yellow-red eyes and glowing, spiky shoulder length hair. He also gains fangs and short protrusions on his forehead, resembling growing horns. The top half of his gi has been been blown off, showing off his stature and the prayer beads that were once around his neck now float about disconnected around his body and has claws on his fingers and toes. In his second alternate costume, his skins shows cracks like old plaster, which progressively falls away as he is hit with Focus Attacks, showing pure, swirling dark energy underneath. His voice also sounds much more demonic and harsher in both the English and Japanese versions of the Arcade Edition.

Personality
Oni, unlike Akuma/Gouki or Shin Akuma/Gouki, is more ferocious and gives up his moral code as a warrior, as well as becoming more demonic in nature. In addition, he now talks in the third person even more, as in he says his own name after defeating or killing his opponents. He also becomes far more evil to the point of calling himself evil incarnate.

Super Street Fighter IV
Main article: Super Street Fighter IV

Oni possesses an air dash attack, the direction of which is determined by the punch button pressed. He also possesses a dashing slash which allows him to pass the opponent by, similar to his Ashura Senku. He also possesses a jumping smash attack which has been compared to E. Honda's Sumo Smash. It also appears that he no longer possesses his Hyakkishu attack. His heavy punch now has the ability to nullify projectiles as well.

His Super Combo is the Raging Demon. However, it can now be used in mid-air when using Oni. His Ultra Combos are new and appear to be based on Akuma's Super Arts from Street Fighter III: 3rd Strike.

His first Ultra Combo, Meido Gohado, is an advanced and more powerful Messatsu Gou Hadou that can be fired from the air. Oni needs to be close and on the ground in order to force his opponent right into the wall in order to blast them with another, with the force of the projectile emitting energy from behind the opponent shaping into Oni's kanji character.

His second Ultra Combo, Tenchi Sokaigen, appears to be a precursor to his Kongou Kokuretsu Zan attack, where he only forms an eruption of energy in front of him. Like the Meido Gohado, Oni needs to be close enough to launch his opponent up into the air in order to slam them with a left-handed Shoryuken to the opponent's exposed back.

Trivia

 * Oni's second alternate costume is the only costume of any character in Arcade Edition which takes battle damage over the course of a fight.
 * Whenever Oni wins the fight, he physically interacts with the opponent's character. He picks them up by their heads, then (off-screen) supposedly deals a killing blow. This is the only fighter in the game that shows physical contact with the opponent after winning a match.
 * Oni also has a similar look to that of the Black Oni from Onimusha - Dawn of Dreams. The darkened skin, white hair, and blue flame-like aura are all main traits of the Onimusha form in general.
 * Oni's theme in Super Street Fighter IV is an alternate remix of Akuma's theme from Street Fighter II.
 * In Super Street Fighter IV, there is a Shin version of Oni. When he fires an Hadouken, it would be fully charged and could travel through the whole screen. He would also move faster and the way he walks is different, he floats as he moves around.
 * Oni's fighting stance resembles the artwork of Shin Akuma from SNK Vs Capcom: Chaos.
 * Oni has the power to cause a volcano to erupt by dealing a single blow to the volcano, but this is most likely a small piece of his power, because in the beginning of Super Street Fighter IV Arcade Edition, he is so powerful that he was able to destroy a large tree with just his aura alone.
 * Oni's Ultra Combos are the only ones (aside from both of Akuma's Ultras) show a black and white changing background.
 * Also, if either Ultra Combo is a finishing move, no "KO" sign will be shown on the screen. The opponent is not seen to physically fall over, but shown collapsed in the ground or midair, implying that Oni has actually killed the opponent.
 * Right after Oni hits the volcano in his ending of Super Street Fighter IV Arcade Edition, he was seen floating in the air. He is also seen floating in one of his win poses where he states "I am not human". It is possible that when Akuma is in this form, he gains the ability to defy gravity.
 * Implied by the quotes, Zangief is the only fighter to notice Oni's increased build mass.