金棒博士

The genius professor recruited by Onimaru and Kumo-Otoko to strengthen Onimaru's Castle with the Onimaru Cannon and repair the Fūjin-ken. He serves as a quirky but loyal advisor to Onimaru. During the Kaguya arc, he builds the special flying submarine to infiltrate Kaguya's hideout and later the Wind Thunder Gods' Bazooka, a giant cannon that combines the powers of the Fujin and Raijin orbs.

(Source: Wikipedia)