Killer Twins appear on the lower floors of the Yabbashah Block within Tartarus. They will boost with Mind Charge before using their Zionga skill. They will later appear in the first section of Antenora within the Abyss of Time. This variant will attempt to Enrage the party to inflict more damage.
Persona 3 Reload[]
Like the previous games, Killer Twins appears in the lower half of the Yabbashah Block of Tartarus between floors 71 and 88. Two stronger versions known as the Slaughter Twins appear as support for the Disturbing Dice boss fight on floor 36 in the Arqa Block.
Persona 4 / Golden[]
Killer Twins appear in Halls 9 and 10 of the Steamy Bathhouse within the Midnight Channel in normal encounters and possibly earlier as Red Shadows. They will generally use their Physical skills or try to cover their weakness with Red Wall so that it cannot be exploited. When defeated, they may drop Gray Shackle. Selling six Gray Shackles at Daidara Metalworks will unlock the Santou for Yosuke Hanamura.
In Golden, Killer Twins appear in Baths 8 through 10 in the Steamy Bathhouse. It acts similarly to its appearance in Persona 4, but use Twin Shot and Virus Wave as their physical attacks of choice. It may drop Fluorite for trade at Shiroku Pub.