Cassette Arms

What Riderman lacked in technological strength of V3, as well as the Riders before him, Rider 1 and 2, he made up for in persistence, smarts, and his wide array of prosthetic weapons to meet his needs. His weapons also were the basis for the "Rider Slash" and "Rider Shooting" finishing attacks.

Cassette Arms

 * Rope Arm (ロープアーム): Riderman's Default/Main Cassette Arm, which is used in various ways: as a means of escape, climbing, and in combat. The arm itself has modified attachments for Yuki to use and adjust to various situations:
 * Hook Arm (フック－アーム): A hook attachment for climbing and combat.
 * Swing Arm (スウィングアーム): A mace attachment, which can be extended and used as a flailing weapon.
 * Net Arm (ネットアーム): An attachment where Yuki's arm can shoot out a net to capture and restrain enemies (by Kamen Rider Spirits, it appears that this net is fireproof).
 * Sickle Arm: An unused attachment, which has been seen in various promotion; and yet, wasn't used in the series. Based on the photos, it is assumed it is simply used for combat.
 * Power Arm (パワーアーム): Riderman's strongest weapon, which increases Yuki's attack in battle. Its primary use is to hack away at both obstacles, such as doors, and opponents. This weapon could've been easily used as a finishing attack, according to some fans. This weapon is the first instance of a Rider using a blade against a monster, which would later be a frequent armament in the Heisei Era-Riders.
 * Drill Arm (ドリルアーム): Another weapon could've been easily used as a finishing move. It was only seen being used as an infiltration tool. It must be plugged in order for it to work best, although it will still work otherwise (by Kamen Rider Spirits, it appears to work just fine without external power).
 * Machine Gun Arm (マシンガンアーム): This weapon was only seen in the Kamen Rider Spirits manga. It was used to destroy the revived Marshal Yoroi in the manga, which had the appearance to be a regular machine gun. This weapon is the first instance of a Rider using a gun against a monster, which would later be a frequent armament in the Heisei Era-Riders.
 * Spray Arm (スプレーアーム): Currently, it is only an unused concept. Its function was described as a weapon which sprays gas or smoke to distract adversaries.
 * Octopus Arm (オクトパスアーム): Currently, it is only an unused concept. Its function is described as a climbing tool, each finger on the hand resembling octopus tentacles.