Parody viper57

[Nobuyuki] Honjouji Akira & Takeuchi Yuka (V.G Hen) (VIPER, Variable Geo)

[STUDIO HUAN (Raidon)] PIPER GTS

(C78) [Graf Zeppelin (Ta152)] VARIABLE VIPERS II -INFINITE PLEASURE- (Viper) [English] [EHCOVE]

VIPER Series Official Artbook III

VIPER Series Official Artbook II

(C65) [Graf Zeppelin (Ta152)] Variable Vipers (Variable Geo, Viper) [English] [EHCOVE]

[Naruho-dou (Naruhodo)] Guruguru Sentou (Viper GTS) [English] [doujin-moe.us]

(C60) [Megami Kyouten (Aoki Reimu, Nonomura Hideki)] Waku Waku Mousou Land!! (Various)

(C57) [Studio Huan (Various)] PIPER GTS (Various)