Goodknightさんのイラストまとめ

Nine the Phantom, Hino-Kagutsuchi, and "Myself" (aka young Nine) concept artwork

Raquel Alucard, Haruka Hayami, Kiiro Hikagami, Spinner Superior, and Saya Terumi concept art. Kaka clan and Bang subordinate renders.

Bell, Homura Amanohokosaka, and Mai Natsume concept artwork

Cypher Albar, Meifang Lapislazuli, and Fuzzy concept artwork

Shiori Kirihito, Kajun Faycott, and Taro Sasaga'e concept artwork

Susano'o and Terumi concept artwork (courtesy of Wisedrow)