Emma’s magic has been shown to be either white or yellow (except when she was the dark one). Regina’s smoke magic is purple, but her actual magic energy is red. Cora’s smoke magic was purple, too. Zelena’s magic has been consistently green, both in smoke form and energy form. I think Rumple’s magic has been shown as mostly red, as has the magic of Peter Pan and Gideon, Rumple’s second son. Also, I think Hook had red smoke magic when he was a dark one.
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy