This model is designed by Karenboy . A lil bit info from wikia : The MSZ-006 Zeta Gundam (aka Zeta, ? Gundam, ? Gundam) is the titular mobile suit of Mobile Suit Zeta Gundam.
Though the unit itself had many pilots throughout Zeta Gundam and Mobile Suit Gundam ZZ, it was most famously piloted by its designer Kamille Bidan.