Is this from other franchises or Mortal Kombat in general?

Other franchises.

Phoenix, Darkseid, Thanos, Monitor, Anti-Monitor, Spectre, Thane, Galactus, Thor, Wonder Woman, Ares, Hercules, Hela, Loki, and any more.

You forgot “Anti” in “Anti-Monitor,” and all of those are unfair. Their Cosmic Awareness is even higher than Cetrion’s and all other gods. Those also have taken on beings more powerful than gods.

Good question i would compare her to anime characters like Kaguya from Naruto, Toshin Raizen from Yu Yu Hakusho, Acnologia from Fairy Tail, Ragyo Kiryuin from Kill la Kill.

As for most comparable characters to Cetrion in MK is Shao Kahn and Shinnok obviously. Raiden might get a chance against her but he has the lowest win chance from all 3 i've mentioned.

I mean, from other franchises, man.

That's why i said some characters above

(Tekken) Angel Jin, Claudio Serafino, Zafina, Jun Kazama

(DC) Poison Ivy, Wonder Woman, Supergirl

(Marvel)Captain Marvel, Thor, Valkyrie, Agatha Harkness, Phoenix

(Assassins Creed) Juno

(God of War) Freya, Gaia, and Athena

(Black Clover) Mimosa Vermillion

(Naruto) Zetsu, Gaara

Ok, then…