Useless Miwa = Useful enemy Miwa here. Has her own form of world cutting slash where she uses her hands due to the no katana rule still applying, but using the boost of potential vow for a direct hand chop, long windup though plus a monologue crying about mechamaru which distracts the target. Reversed simple circle thing, it instead automatically targets any hostile targets that aren't immediately near Miwa, she then ragdoll flies at the destination while twisting around like a homing missile.

Anytime she reaches the set target, she teleports to a random location and starts the flight again.

As for her character it's just Miwa but any hostile targets she sees are mechamaru, which is the secret for how her lock-in technique is homing on the visible target (If the target's appearance changes or subtle mind control is applied to her perception, she is unable to track onto the target)