Arei has red eyes and messy black hair which she ties in ponytail. In her first appearance, she wore a Tokiwadai jacket. Underneath she wears her full body suit along with her skirt.
Normally stoic in her expression, she is however quite merciless when it comes to her enemies, beating down Makigami Komaki so much that even Yumiya Iruka showed concerned that she was overdoing it. She also enjoys it when her opponent is strong enough for her in battle, as with the case with her fighting Hokaze Junko, after she momentarily bested her and making her bleed from her nose.
In spite of this she does value her friend Iruka, as she concedes to her wishes even if interrupts her love for battle, and shows concern over her well-being especially when it came to their plan against Junko and Shokuhou Misaki. After her escape and Iruka's capture with their mutual defeats from Junko, Arei tries to fulfill Iruka's wishes of wanting people to admire Junko, and describes her as an older sister who loved her little sister. Indeed, she hoped that Iruka would take a different path than her and her boss.
Astral Buddy ArcEdit
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Her ability allows her to hear people's emotions as sound. She has trained herself to interpret this emotional sound as locations, directions and distance in 3D space.
During her last battle with Hokaze Junko, she made use of Hard Taping Custom (