Now that I really think about it... has there ever been an in-universe explanation for the sheer amount of expys? I know that theres a reason for the Kagamines having so many clones, but I'm not sure on the rest of the Vocaloids.
Adam Moonlit
Moonlit BearKaspar Blankenheim
Nemurase Hime Kara no OkurimonoKarchess Crim
Venomania kou no KyoukiGallerian Marlon
Akutoku no JudgementKyle Marlon
Aku no Musume / Shinon no TokeitouKai Miroku Enbizaka no ShitateyaCarlos "Joseph" Marlon
Akujiki Musume Conchita / Drug of GoldGEAR
Heartbeat Clocktower / Chaban Capriccio