Dark Guardian soldiers

Dark Guardians are the titular human hybrid soldiers of the organisation of the same name.

They are completely obedient soldiers who have extreme loyalty toward Francisco Nightingale and he actually created their helmets which allow the soldiers to travel at extreme speed of over 200 mph and have enhanced strength and are extremely stealthy and only make a loud screaming sound just before they attack.

They are considered human hybrids due to their ability to fly and become temporarily invisible for a temporary amount of time.