The UEBSD is a group of Shadow Demons (unrelated to Zero's) bound to different animatronics, created by Carter Simmons.
Carter Simmons Edit
Species: Shadow Demon bound to an Endoskeleton
Bio: The first Shadow Demon that Carter ever summoned/created. He was born using the energies of slayed Shadow Demons, then immidiately bound. He will continue to serve with Mr.Carter in the UEBSD.
Ability: Astral projection through space/time.