ACK! Dude! I wasn't ready. Mostly because I'm changing my fruit. As cool as the Aura/Split fruit is... after Age of Ultron, superspeed is looking pretty sweet. So how about the Swift-Swift fruit? Anything like that in canon?

Nothing except the Pika pika no mi, which is suuuuuper OP. I just wanted to get this started while the idea was fresh so I didn't forget it.

Yeah, she can't move at lightspeed. Eventually supersonic speeds, but that will take a while. For now, think of between Shave and Gear Second as her base speed, only with greater mobility, agility, and reflexes. Basically she would enter an accelerated state, where her whole body is moving at faster speeds, even if standing still. Eventually, she'll learn to isolate the effect, but for now, whole body. She's also kinda destructive in her speed at the moment (the faster the object, the stronger the impact, plus wind, vacuums, kinetic build-up, and friction), and has trouble stopping. Eventually she'll be able to weaponize these side-effects and be able to stop on a dime (literally).

For now, she's in prison with a seastone collar.

I'VE GOT A LOVELY BUNCH OF COCONUTS