Tabuu is the final boss of the Subspace Emissary mode of Super Smash Bros. Brawl. He has a transparent humanoid figure, with a pair of red eyes and a strange object inside of him. He is the "embodiment of Subspace" and created the Subspace Army. His name is a corruption of the word "taboo", which means unacceptable or improper by society's terms. The spelling of his name is derived from a katakana transcription of the word, romanized for English language releases.
Tabuu observed the Trophy World, and for unknown reasons, desired to cut it in pieces and drag it to Subspace. However, Tabuu could not leave Subspace, and thus needed to create an army and recruit followers to invade it in his place.
Tabuu studied the world and its inhabitants, eventually deciding to possess Master Hand, the master of the trophy world. Using Master Hand, he recruited Bowser, Ganondorf, and Wario to hunt down anyone who could challenge him. To drag the world into subspace, Tabuu took the Isle of Ancients hostage and intimidated its leader, who, fearful of losing members of his own kind, agreed to work for him by manufacturing Subspace Bombs and other weapons. Tabuu also used Mr. Game & Watch to create the Subspace Army and stole the Halberd from Meta Knight to have a transport for his army.
 The Subspace Emissary
After suffering a humiliating defeat, Ganondorf and Bowser enter Subspace to seek out Master Hand. Planning to take control of the army, Ganondorf betrays Bowser before approaching Master Hand and bowing before him. Just as Ganondorf prepares to attack Master Hand, Tabuu reveals himself. Ganondorf tries to free Master Hand by attacking Tabuu. Tabuu easily overwhelms Ganondorf, turning him into a trophy with a single attack. Ganondorf falls on Master Hand with enough force to sever Tabuu's strings of light, freeing Master Hand. The weakened Master Hand attempts to destroy Tabuu, but Tabuu easily reflects his attack, stunning Master Hand.
The heroes arrive and confront Tabuu. Tabuu spreads his wings and releases his ultimate attack, the Off Waves, instantly transforming every fighter to their trophy form. Tabuu then uses the energy of all the lands sent to Subspace to create his own world, The Great Maze. However, Luigi, King Dedede, and Ness return back to their original states thanks to the brooches Dedede had invented. The three travel to Subspace and return the heroes to their original forms.
Ganondorf, Bowser, and Wario decide to help the heroes. The heroes and villains travel through Tabuu's maze so they can find him. They battle through many dark forms of the creatures of the Subspace Army and even all the heroes and villains. They make their way into Tabuu's lair for the final showdown. Tabuu prepares to use his Off Waves again, but Sonic the Hedgehog appears and attacks Tabuu, shattering his wings and preventing him from transforming the group into trophies.
The heroes face Tabuu for the Final Battle. Tabuu has numerous powerful abilities and skills, but the heroes manage to defeat him in the end. All the worlds taken into subspace and all the characters are returned to the Smash World. Subspace and Tabuu are destroyed forever, and the Smash World is returned to normal.
 Powers and Abilities
Off Waves: During this attack, Tabuu appears in the background and opens up his wings which proceeds to release three red shock waves. These shock waves deal very high damage and knockback, enough to one-hit KO on normal and higher difficulties in SSE and on very hard and intense difficulties of Boss Battles. To avoid the shock waves, a character must either roll or sidestep dodge with accurate timing. If playing as Pokémon Trainer, Kirby, or Zelda/Sheik ,using Down B the instant Tabuu extends his wings also works. The player can also Perfect Shield, despite the fact that the attack is unblockable. The effects of a Metal Box will help resist this attack, in which case, the character is only slightly pushed.
Dark Cannon: Tabuu appears on one side of the stage and takes out a Dark Cannon, which fires a powerful laser that can only be dodged with a jump.
Side Spear: Tabuu transforms into a wide spear and attacks sideways with one swipe.
Chain of Light: Tabuu takes out a yellow chain, grabs the character, swings them around and slams them onto the ground for high knockback. This move uses the same type of chain that he used on Master Hand.
Dual Eye Lasers: Tabuu transforms into a giant version of himself and appears on either the left or right side of the stage, before unleashing red lasers from both his eyes. They mostly work the same way as Master Hand's lasers, including leaving their user vulnerable to attacks, but Tabuu's lasers are significantly more powerful, and are different in that they only take effect at the point of contact with the stage. They can be avoided by running to the edge of the stage where Tabuu is located.
Energy Blade: Tabuu appears in mid-air on one side of the stage and attacks the stage with a curved swipe of a red energy sword. It is avoided by jumping.
Teleport: Tabuu teleports around the area and appears at a set spawn position which is randomly decided from the large amount of spawn points available. He also sometimes teleports behind the character and attacks.
Teleport Explosion: Same as his normal teleportation move, but it creates a red explosion everywhere he teleports.
Electrical Shield: Tabuu teleports to a random area and releases energy from the object inside him to circle around him like a shield and attack.
Rapid Claw: Tabuu teleports behind the character and rapidly slashes the area near the character. The attack has less range than the visible shockwaves would indicate.
Golden Bracket: Tabuu transforms into two brackets and flies across the stage, grabbing the character (if he's not avoided) and slamming them onto the stage. On Intense difficulty, this attack is a one-hit KO.
Pinpoint Explosion: Tabuu points at five locations which will blink. Those locations will explode after a second, damaging anyone who did not move away in time.
Bullet Rain: Tabuu appears in a random area in the air and fires a series of small, magical bullets. Tabuu concludes this attack with a powerful energy blast, all of which is avoided by staying behind him.
Shuriken Boomerang: Tabuu appears on one side of the stage and throws a round boomerang which crosses the stage twice before he catches it. This is avoided by jumping and using Up-B (depending on character) to avoid the second swing.
Self Projection: Tabuu pauses in midair and sends out copies of himself in all directions. Characters will take damage if they make contact with a projection.
 Character Depiction
Tabuu is a manipulative and evil person. He is willing to destroy those standing in the way of his goals. Tabuu shows the capability to manage diverse groups for his own purposes. Tabuu is deliberate and willing to plan his actions beforehand, waiting a long while before they succeed.
 Trophy Information
The Tabuu trophy is earned by use of a Trophy Stand. To get the Tabuu (Wings) trophy, the player must clear the Boss Battles game mode with every playable character.
 Names in Other Languages