Will they get there in time to help the azure pegasa?

Don't you mean Pegasus?

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Whether strictly in the fandom or not, I have seen pegasus pluralized as pegasi, suggesting a Latin origin to the word. And, with that in mind, it made sense to me to apply Latin masculine and feminine suffixes to the word as appropriate: a female pegasus then would be a pegasa, two or more female pegasi would be pegasae, and so on. Thus, Rainbow Dash being a female, she'd be a pegasa.