Kamen Rider 001 (仮面ライダー001) is an alternate version of Kamen Rider Zero-One that appeared in Kamen Rider Reiwa: The First Generation.

When the Zero-One Driver was rendered unusable, Aruto Hiden was given a Forceriser as an alternative by a mysterious individual. Fighting in a timeline where Humagears have taken over the world, Aruto attempts to correct his world with the help of the king of time Kamen Rider Zi-O.

Kamen Rider ZeroZero-One's base form is called Rising Hopper (ライジングホッパー), accessed using the Rising Hopper Progrise Key in the Forceriser. Unlike the Zero-One Driver, the Forceriser is less flexible, focusing on brute strength than using various abilities.

First appearance: Kamen Rider Reiwa: The First Generation