Again, idea from: CrystalVioletVelvet

Man… I just LOVE coming up with these ideas for pony fusions… They are so awesome!

Description:
Thunderfly is a brave, selfless and heroic pony. She’s very enthusiastic and comfortable with herself, but only when there are friends to remind her how great she is. She needs constant approval, but doesn’t like to show it, so instead she hides her emotions behind fake confidence.
Thunderfly has a big heart, she’s full of love and compassion, but prefers to act tough to the point of being slightly rude. In other words, she’s a total tsundere. A very cute one, as well. Also has some anger issues, so watch out.
She really loves animals, although still not as much as Fluttershy on her own. That pony feels natural and confident both in the sky and on the ground and sees beauty in nature more than anyone else. Despite having six gorgeous wings and an exclusively beautiful flight cycle, Thunderfly… is not that good of a flier - at least compared to Rainbow. She’s certainly graceful and pretty agile, but not fast at all.
Written by: CrystalVioletVelvet