The Wise Old Man (also known as Monishiri and known in Japan as Jiisan) is an inventor in the Ganbare Goemon series. He is, as his name implies, one of the greatest creators in Edo as he builds many devices, including Sasuke and Impact. However, he has some odd habits; he enjoys chasing and looking at young women, looks at pictures of women in magazines, and a few of his inventions were built for aiding him get a closer look at them. In the non-Japanese versions of the games, however, he never mentions this, and his magazines are replaced with car magazines. He still retains these habits in the translation of the anime.
Sasuke: a robotic ninja that first protected the Wise Old Man. In a misunderstanding, he attacked Goemon and Ebisumaru. Now friends with them, he is a playable character in many games. In the anime, he is also designed to take pictures of young women, as he seems to attract women.
Impact and Miss Impact: Gigantic, friendly robots modeled after Goemon and Omitsu. When Goemon and his friends must face giant threats, they are summoned, and Goemon and his friends control them to fight the menace.
Time machine: used in Ganbare Goemon 3: Shishi Jûroku Hyôe no Karakuri Manji Katame! to travel through time. Originaly designed to chase young women in the future.
Super Gorgeous Ghost Machine: created to revive dead people. Sister Bismaru stole it to revive Dochuki, Boss of the Underworld.
Transporter: used to transport characters in the game world to the real world.
"Cutie Detector": in the anime, used to take pictures of attractive women while shouting "Cutie alert!". It has some bugs, as it identified Tsukasa as a "cutie".
- He mentioned Marilyn Monroe and James Dean in Goemon's Great Adventure, when saying who he planned to revive.