[X] Level 5 (#6 Aihana Etsu, a wonderful blank slate to work with)
-[X] Acceleration
We keep moving in a circle about an inch wide for an hour or so and then punch somebody across the planet so hard they themselves reach the speed of light. Or we just hold onto a rock and let that hit them instead so we don't break our arms.
I'm sad that nobody's realized that a cloud of Nanomachines gets mono-molecular blades as one of the prerequisites for it even being able to exist in the first place. I mean, we're the perfect shapeshifter, who's also a robot with all of the perfect memory and processing powers that entails, who's just as good as a Kihara in the science department as far as book knowledge goes because we've literally memorized the book.
We wouldn't have to deal with leverage in Kung-fu fights (Heck, we'd just swarm somebody in kung fu fights because only Accelerator would even be able to block all of our body at the same time), we wouldn't have to do squishy people stuff, we could slither into one of however many storm drains or cracks in the pavement if we need to run away, and we'd be able to make "I'll be back" jokes just like the Android option.
The only thing Nanomachines won't give you that being a Kihara will is the insanity that causes them to do crazy things that sometimes work.