-Zarina is the Alchemist fairy. So she figured out how to make other color pixie dusts from the traditional blue and yellow using a variety of items (like sunlight and flowers, etc.). From those new colors (like orange, purple, blue) she created new traits that match the traits of the fairies (water, speed, light, ability to communicate with animals, flowering, etc.). So she has the capability of switching the traits of other fairies. Her original job as the "dust-keeper" was to pass out rations of yellow fairy dust (which gives the fairies the ability to fly) out. It's an interesting movie (Pirate Fairy) because it gives the origin story for Captain Hook before he was Hook.
-Turns out Periwinkle (frost fairy) is Tinker Bell's sister. They use their wonder twin powers to heal Tinker Bell's broken wing.
-Vidia is the bad girl of the group and always seems to get Tink in trouble. Jealousy amidst....
-Iridessa and Silvermist are easily the forgotten fairies as they have yet to play any large role in any of the movies.
I have seen all of the Tinker Bell movies way more times than I'd like to admit (like a BAZILLION)...

Hooray Netflix!