Ancient Minister

The Ancient Minister seems to be an antagonist of The Subspace Emissary in the game Super Smash Bros. Brawl. He is the commander of the Subspace Army as well as the leader of the R.O.B.s. As commander of the army, the Ancient Minister assists Tabuu in his plan to pull "this world" into Subspace using Subspace Bombs. He is capable of flight and the bottom part of his body can fire lasers. The Ancient Minister can be commonly seen carrying Subspace Bombs around the land.

Background
Before the events of the game, the Ancient Minister is known as R.O.B. and he is the leader of the R.O.B. race of robots. R.O.B.'s official title is the "Master Robot". He and the other robots lived on the floating Isle of Ancients and watch over this world. Indeed, R.O.B. is the overseer of this world and is considered the world's "lord." However, this world is eventually invaded by Tabuu, a humanoid entity from Subspace. He attacks the Isle of Ancients, deactivating many R.O.B.s and eventually taking the robots hostage. R.O.B. is forced to ally himself with Tabuu in order to prevent the deaths of more of his robot brethren. It's at this time that he began to hide under his ceremonial robes of mourning and assume the name "Ancient Minister". The Isle of Ancients is converted into The Subspace Bomb Factory and the Ancient Minister becomes the commander of the Subspace Army. As the commander of the army, he leads the invasion of this world on behalf of Tabuu.

Super Smash Bros. Brawl
The Ancient Minister first appears in the Subspace Emissary after Mario and Kirby's match at the Midair Stadium, where he detonates a Subspace Bomb, sending the stadium to Subspace. The Ancient Minister escapes, only to be later chased by Mario and Pit in The Plains, who have little success catching him. He then detonates another Subspace Bomb at The Battlefield Fortress, attracting the attention of Marth, Meta Knight, and Ike. Regardless of the group's efforts, he manages to escape their grasp, however, he is soon discovered by Mario and Pit once again, along with Link and Yoshi. Again, the Ancient Minister escapes, but not before detonating yet another Subspace Bomb, sending King Dedede's Castle into Subspace.

The Ancient Minister isn't seen again until Samus Aran and Pikachu corner him at the Subspace Bomb Factory. Samus and Pikachu are ready to fight, but the Ancient Minister refuses, growing depressed at the amount of R.O.B.s sacrificed to activate the Subspace Bombs, confusing them. Soon after, Donkey Kong, Diddy Kong, Captain Falcon, and Captain Olimar arrive, also battle-ready, but the Ancient Minister still refuses. A holographic Ganondorf appears, quickly realizing that he has betrayed him. Using a remote-controlled button, he is able to control the R.O.B.s, ordering them to attack the Ancient Minister and activate every Subspace Bomb in the factory.

The Ancient Minister reveals himself to be another R.O.B. and alongside the other heroes, is able to defeat the Auroros and other Subspace Army members that Ganondorf summons to defeat them. Using the Falcon Flyer, the heroes escape the Subspace Bomb Factory before all of the Subspace Bombs detonate. From this point on, the Ancient Minister, now named R.O.B., joins the heroes in the fight against Tabuu.