Faster than any pony alive, it's Fili-Second!

Notes:

With her supersonic speed and her amazing agility, there's not way you can stop this superhero! We could never determine her top speed! Really! Every speed radar that we could hit her with blew up when she zoomed past us!

Requested by saneman1

WHO WILL APPEAR NEXT?
You wouldn't like her when she's angry! This superhero is capable of turning into a raging beast whenever she sees someone mistreated! If you mess with her, then your last words are going to be, "Oh, no…"!