When a party for various celebrities and dignitaries held to increase awareness of Vorozheika was attacked by armed gunman, several of the Eternals present briefly used their powers, albeit instinctively.
As presented in Gaiman's Volume 3, the Eternals are aware of their role on Earth and the duties and constraints placed on them by the Celestials.
To this end, the Polarian Eternal was assigned to be the communicator for the Celestials and was then placed in suspended animation within the Temple of the Space Gods, and Ikaris was charged with attuning his senses to detect the Celestials upon their next arrival on Earth.
Unfortunately, Sersi failed in her mission and Makkari was killed, with no way of being revived thanks to the destruction of the Reactivation Chamber.
The people of ancient Greece and Rome often confused the Olympian Eternals with the Olympian Gods.
Conceptually, the Celestials are something unfathomable and Lovecraftian despite their friendly, familiar appearance, and the comic captures their unknowability whenever the Eternals are able to communicate with them.
For a human to break a Gann Josin is an astounding act.
Sleiman portrays the character's husband, and the pair have a child in the film.