Ultra Dark-Killer is a Giant of Darkness, born from the grudge of the monsters and aliens defeated by the Ultra Brothers.
It was once defeated by Ultraman Taro, but is revived from death.
It can create Darkness warriors by stealing the energy of light from the Ultra Heroes and merging it with the Killer Plasma.
Ultraman Orb Darkness is a Darkness warrior that is created by merging the energy of light stolen from Ultraman Orb with the Killer Plasma.
Its appearance is incomplete as the absorption of light energy from Ultraman Orb is interrupted, but it is already as powerful as Orb.
Ultraman Zero Darkness is a Darkness warrior that is created by merging the energy of light absorbed from Ultraman Zero with the Killer Plaster.
It is a realization of Zero's emotional wound and has the exact same appearance as Zero Darkness.
A dark being with evil wills. Once defeated by Ultraman Ginga, but it is revived together with Ultra Dark-Killer.
Seeking for revenge, it helps Dark-Killer to create the League of Darkness.
A demon who wears a robust armor.
Once defeated by Ultraman Ginga and Victory after they were trained by Ultraman Zero, it is revived together with Ultra Dark-Killer.
Seeking for revenge, it helps Dark-Killer to create the League of Darkness.
Ultraman Tregear was born in the Land of Light and was once a friend of Ultraman Taro, but fell into the dark side.
He approached Ultra Dark-Killer for some unknown reason.