Tempest Shadow was saved twice by Twilight Sparkle. First from The Storm King, then from punishment for what she had done under his command. It would stand to reason that she feels eternally grateful towards the princess of friendship and promises to do all she can to repay the kindness she has shown her.
But now Tempest, or is it Fizzle Pop, feels like she cannot fulfill that duty to Twilight, at least not while Twilight herself is around her.

I honestly put off watching the movie for so long because I didn't know how I would feel about it. It was better then I thought it would be, but I was most interested in the new character it added to the series. The prevalence of Tempest fics lately has led me to finally decide to do my own. I'm really interested in diving into a not as well defined character for once, so let me know what you think of my interpretation of her. Comments are always welcome, good or bad.