Rin Hirano, is another captive forced to participate in the killing game, however unlike the other participants it is unknown what her talent is. She is generally stonefaced and unflappable, as a part of her design as a "enigmatic" character. She is nicknamed the Ultimate "???" because of this.

She's is mysterious, cryptic, composed, and always uses logic to analyze the situation and solve the problems at hand. Rin is generally hard to read and because of this the students have difficulty seeing her as an ally... and some even suspect that she's an enemy.

(Her personality is based on Rei Ayanami. That's all you need to know.)