Kazuyoshi Aoyagi

Kazuyoshi Aoyagi (青 柳 和 良) is an old friend of Natsumi and a founding member of Club TG. His counterpart of Nega World was killed by the Dark Riders and supplanted by Dark Kabuto.

Under orders from Otoya, Kazuyoshi / Dark Kabuto and his partners tricked Natsumi to meet her Nega world counterpart and lead them to his treasure (The Decade K-Touch). He dies battling Decade in his complete form.

Dark Kabuto Zecter

 * Owner: Souji Kusakabe
 * Device Type: (Dark) Kabuto Buckle ('Henshin' Belt)
 * Animal: Kabutomushi or Japanese Rhinoceros Beetle
 * Color: Black/Red
 * Cast-Off System: Flipping the switch-like Zecter Horn on the Dark Kabuto Zecter over.
 * Cast-Off Announcement: "CHANGE BEETLE"
 * Clock Up System: Slap the Switch-pads on the hip of the belt
 * Primary Finisher: (DARK) RIDER KICK - Dark Kabuto inputs the button sequence [1-2-3] on the Dark Kabuto Zecter and switches its horn-like lever back to its default position. When the horn-switch is flipped again, a tachyon charge surges from the Dark Kabuto Zecter to the Dark Kabuto Horn where it is refined, then directed down to Dark Kabuto's right leg, which is then executed as a flying kick, although various variations have been seen.
 * In PS2 tied-in video game, Dark Kabuto perform it by using heel-drop kick pinning the opponent in place, then crush him with tachyon-charged stomp.

Rider Belt

 * (Dark) Rider Belt: A different version of Kabuto's Rider Belt, designed by ZECT specifically for the Dark Kabuto Zecter. It is still unknown what different features it may possess. However, unlike the Kabuto's one, it releases waves of black energy, rather than the normal blue.

ZECT Kunai Gun
ZECT Kunai Gun (ゼクトクナイガン Zekuto Kunai Gan): A versatile weapon with 3 distinctive modes: Ax, Gun and Kunai Mode.
 * “Ax Mode” becomes active when the gun barrel is held, and using the bladed butt of the weapon like a tomahawk; AVALANCHE BREAK can be performed in this mode.
 * “Gun Mode“, the default mode, fires high-intensity ion beam blasts and is equipped with tri-laser targeting; AVALANCHE SHOT can be performed in this mode.
 * “Kunai Mode” activates when the gun barrel is detached, unsheathing a short-dagger weapon good for its swift and easy handling; favored most when Dark Kabuto switches to Rider Form; AVALANCHE SLASH can be used in this mode.

Trivia

 * Similar to Kabuto, its design is based on a "Kabutomushi" or Japanese rhinoceros beetle.