Anyone got some ideas for their powers, names & backstories?

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I suck at names but I can see the twins sorta being like Captain Marvel. Both twins could be together, say the name of the hero they are, and one lightning bolt later, you have a grown alicorn in costume. That to me seems like the most obvious thing that could be done with them. The other logical option is to make them sidekicks to Filisecond, though I don't know how that would work.