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"It's something to talk about later. I meant to tell you that I received a message from my great uncle. You are welcome in Asgard."

Seriously, MLP is rooted in Break mythology, not Norse. And if you're going to use the MCU version of Asgard, you need the Crossover tag

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I don't want this to come across as rude (let me know if it does), but MLP is rooted in pan-Indo-European mythology not Greek specifically. Unicorns, for example, are from Medieval Western Europe. The Sun Goddess is Norse and Celtic (the Greek solar deity was always male.) And as for the horse that pulls the sun, that is also pan-Indo-European.

This statue found in Denmark (the Trundholm Sun Chariot) could be Celestia herself in as much as the archetype of the Sun Horse has filtered down to us today through our ancestral collective unconscious.

scholiast.org/history/denmark/solvogn.jpg

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Yes but all the creatures we've come across are Greek in origin.
Cerberus the 3-headed dog who guards Tartarus, which is both a Greek deity and a place in Hades, the Greek hell/underworld
Minotaurs like Iron Will are Greek
Pegasi are Greek, because the first pegasus (aptly names Pegasus) was a winged horse that some heroes rode in on
Griffins are Greek
Centaurs like Tirek come from Greek mythology as well
Chimeras are Greek as well

I say that MLP is rooted in Greek mythology because there are more Greek mythology references than any other mythologies

Twilight's cheeks colored like Celestia's had and she sunk down into the seat. "Oh, my lord. Poor Thunder Cloud. He even gave Moon Dancer that treatment and she was a filly!"

"Yeah, I'm surprised he didn't get the Crystal Guard to go on a diplomatic trip to Mustangia."

"Cadence probably put her hoof down."

Yeah she probably did