While the CK's are named after Cid, when the forums were sold they also split from the original Cid of which they serve. In an alternte reality of FFVI where Banon is named Cid, Each of the Knights are actually the cast of FF VI in disguise.

Azar = Strago
Behold the Void = Gogo who is Aizen in Disguise. (Bleach refrence xD)
eestlinc = Shadow
fire_of_avalon = Umaro
Flying Mullet = Locke
Hsu = Mog
Koshiatar = Relm
Levian = Sabin
Miriel = Terra
Psychotic = Edgar
rubah = Celes
Zeromus_X = Setzer

Some of the Admins are also returners in hiding
Del Murder = Cyan
Shlup Quack = Gau

Other Admins are not exactly Returners but are still in FF VI
Kawaii Ryűkishi = Ultros
Leeka = Leo
Loony BoB = Biggs and Wedge.

crono_logical, Roogle and SamuraiD are the warring Triad who keep EoFF from falling apart.