Matador is derived from the late Latin word matare, which means to subdue or kill. It is also the name of the toreros that perform in the bullfighting events famous in Spain. Matador is one of the toreros, and the word literally means "killer", as it's the matador's job to kill the bull.
"A Spanish Grim Reaper born from the pursuit of aesthetics killing. With his terrifying sword Espada, he now preys on humans rather than bulls."
—Shin Megami Tensei III: Nocturne Compendium
Matador appears as a boss in the updated release of Shin Megami Tensei III: Nocturne, titled Shin Megami Tensei III: Nocturne Maniax. He is first mentioned by a Manikin in the Great Underpass of Ginza, where he is known as a "Grim Reaper". The Demi-fiend must defeat him in order to reach Ikebukuro, headquarters of the Mantra. Upon approaching the demonic presence, the Demi-fiend was forcefully summoned into another realm by Matador, where Matador claims that a weak being like Demi-fiend doesn't deserve to hold the Candelabrum of Sovereignty, but knowing that the Demi-fiend will not give in without a fight, Matador engages the Demi-fiend to a battle.
He appears as a skeleton dressed in a bullfighter's costume, and speaks of fighting for an audience with style and flair, even though their present environment (a desolate wasteland dimension, used by all fiends) is lacking the aforementioned. After defeating Matador, the Demi-fiend gains the ability to fuse him by fusing any two demons whose fusion will result in a Yoma race demon, during a 1/8, 2/8, 3/8, or Half Kagutsuchi phase. Such a fusion requires a Deathstone, an item found only in the Labyrinth of Amala.
Matador appears as a boss in the twenty-seventh floor of the solo instance Denshi Kairo, branching pathways depending on whether players kill him or the Nandi that spawn alongside him first. Matador is also an optional boss in the Suginami Tunnels (Bronze) dungeon if you use an Ultimate Summon Orb, replacing Great Beast Garm.
To acquire Matador the player must fuse him by acquiring his plugin from exchanging five hundred Essences of Yetzirah that are obtained by clearing Hack Chip α dungeons. He cannot be contracted.
Matador has a 1/256 chance of appearing in the Toyosu Shelter, at the small vent near the center of the shelter. (see below) His Almighty-spam mode is set by Phys resistance. Upon defeat, he drops the Capote Earring, arguably one of the best accessories in the game.
Margaret wishes to see a Matador that has inherited the skill Mahama as the second request in her Social Link. This will grant a new rank in the Empress Arcana and can be done through several Fusion options.
Firstly, the player may opt to merge a level 19 Anzu with a Berith in a simple Fusion.
Second, the player may opt to perform a Triangle Fusion that will meld either a Power or a Principality (Principality must be at least level 21 to be viable, however) with an Oberon and a Saki Mitama.
Finally, the player may opt to perform a Triangle Fusion with a Power, an Andras and an Omoikane.