Dead Master (デッドマスター) is the Otherself of Yomi Takanashi, Mato's classmate and eventually one of her BFFs by the end of the anime series.
It was unknown when Dead Master was awakened, but she was shown to be under Chariot's control presumably since the accident that bound Kagari - Chariot's human counterpart - to a wheelchair. Thus, Chariot's control over Dead Master reflects Kagari's obsession over Yomi until Yomi's strong will to be away from Kagari makes Dead Master break the chains that were binding her, and destroying Chariot's zone in the process. However, before Chariot's "death" at the hand of Black★Rock Shooter, Dead Master is transported away by Black★Gold Saw.
Later, as Mato and even Kagari spends less time with Yomi, her psychological need to have someone need her more than anyone else, worsened by Saya - Black★Gold Saw's counterpart, makes Dead Master a fully-powered and independent Otherself, as planned by Saya in the hope of stopping Black★Rock Shooter. Black★Rock Shooter arrives at Dead Master's zone and engages her and her army of undead in combat. Dead Master is eventually "killed" by Black★Rock Shooter, but later comes back to life in the finale to help Black★Rock Shooter defeat Insane Black★Rock Shooter.
Powers and Stats
Tier: High 4-C
Name: Dead Master
Origin: Black★Rock Shooter
Powers and Abilities: Superhuman Physical Characteristics, Weapon Mastery, Chain Manipulation, Summoning of her undead army, Pocket Reality Manipulation, Regeneration (Mid-Low), Immortality (Type 8, dependent on her Real World self), Resistance to Time Stop (could move in Black★Gold Saw's stopped time)
Attack Potency: Large Star level (Matched BRS in combat, and her very own existence maintains her zone, which is similar in size to Chariot's, as the area crumbled when she "died")
Speed: At least Transonic (Comparable to BRS)
Lifting Strength: At least Superhuman
Striking Strength: Large Star Class
Stamina: Extremely high
Range: Ten of meters (About a dozen)
Standard Equipment: Dead Scythe, Two Giant Skulls, Army of skeletons
Intelligence: Skilled Warrior
Weaknesses: She ceases to exist if Yomi Takanashi, her human counterpart, dies
- Chains Bind: Uses her chains to binds her opponent
- Skeletons Spawn: Summons Skeletons out of her chains