Night Knight

Night Knight is the Omnitrix's DNA sample of a Negroian from X-B21.

Appearance
Night Knight appears as a suit of armor. If the armor is removed or the eyeguard lifted,  he comes out of the armor, turning into a huge black blob which makes everything dark.

Night Knight's armor looks like the armor of the Forever Knights, because the Forever Knights stole their armor design from the Negroians. Since all the Omnitrix aliens turn green in some way, a few pieces of Night Knight's armor are green. His Omnitrix symbol is on his left arm.

Powers
Night Knight can Transfrom into and manipulate shadows. When his armor is removed or his eyeguard is lifted, he comes out, revealing his true form: a huge, black, shapeless, blob which makes everything pitch-black until putt back in his armor or reverted to Ben.

Weaknessess
Other than making everything dark, Night Knight has no real powers once he has exited his armor. If  one were to leave the vicinity of his true from, they could see again.