Mamoru Hirai

Mamoru Hirai (平井マモル Hirai Mamoru) is a new physics teacher in Prism Academy.

Hye notes that Mamoru shares the same physical traits as Shun and thus, is suspected at first to be Shun himself. To confirm whether he is Shun or not, Hye opens a Fuzetsu and found that he could not move in it, like other humans. Later, he is found out to be a fragment of Shun to be used in an evil plot to keep an eye on the Guren no Oodachi for later use, seal it to prevent from escaping by using the Zanpakuto, Aster, and to collect his memories of interacting with Ren and the others.

Appearance
Mamoru shares almost all of the physical characteristics of Shun. One difference that can be noted between them is that Shun has rouge hair and blue eyes as opposed to Shun having dark blue hair and eyes.

Personality
As a teacher, Mamoru is sophisticated and stern when it comes to discipline of his student, unlike other teachers, he scolds his students with soft tone which most of his students intimidated by him, as shown when he scolds Hye and Ren trying to escape secretly during lesson time.

He develops a bond to Ren while Hye and Nanase on the edge of uneasiness and in the battlefield, he is cautious and observant, rarely shows any panic or distress and uses honorifics "-kun" when addressing everyone including to his students and his enemies.

History
TBA

Zanpakuto
Aster (星 Hoshi (アスター Asuta): Shun's Zanpakutō resembles a katana, with a rectangular bronze cross guard and dark red handle.

Shikai: Its shinkai command is "Illuminate" (照らす, Terasu), his zanpakuto transfoms into form of a golden staff with six stars rings dangling on a bigger triangular ring. He releases a rain of Reiatsu on her enemies, forming a large swarm of energy blasts whose blinding speed and ability to track down and destroy enemies make it a difficult technique to avoid. On impact, it gives off an explosion. The time of the explosion can be controlled at will by the caster.