Robotic Angel

Badass Automaton of angels or similar spiritual beings. Frequently, heaven tends to keep track on technology, and angels are often the military force of such place. They can serve for a host of purpose, often holy or neutral depending on what their jobs requires. This could land in the Rule of Cool, thanks to the combination. They could also be artificially created and become a version of Holy Hand Grenade.

Anime and Manga

 * Steel Angel Kurumi has steel angels. They were said to be created by a Mad Scientist and were call "dolls".
 * Angeloids in ''Sora no Otoshimono.
 * The sole inhabitant of the Imaginary Number District in A Certain Magical Index is an artificial angel, definitely of the Holy Hand Grenade sort.

Fan Works

 * Fusion Gundam in Final Stand of Death are this thanks to being angels fused with Mechanical Lifeforms and humanoid wolves.

Film

 * Seraph from The Matrix series was created by the Oracle to serve as a "guardian angel".

Video Games

 * A common theme in the Shin Megami Tensei series, especially in depictions of Metatron, who is often depicted as humanoid robot. Other high ranking angels also have partial or completely robot motifs on occasion.