|Full Name||Chiba Toshikazu|
|Weapons & Equipments|
|Voiced By||Hidenobu Kiuchi (Anime)|
|Novel||Volume 6, Chapter 1|
|Anime||Episode 19, Yokohama Disturbance I|
Erika is Toshikazu's little half-sister. Despite Erika's antagonism with him, Toshikazu really does care for her and considers her a true part of the Chiba family. Because he considers Erika to be his cute little sister, he enjoys teasing and antagonizing her.
He seems to be attracted to her and gets along with her whenever he works with her.
The only interaction he had with Tatsuya incident was in Yokohama when he met with him and try to stop it, so it was presented as "the special Lieutenant Ooguro Ryuuya of the 101 Independent Magic-Equipped Battalion" leaving him confused and then jump from building and go to fly away.