Ken (ケン) is the main antagonist in Crayon Shin-chan: The Storm Called: The Adult Empire Strikes Back. He is the leader of a project called "Yesterday Once More" which aims to bring the world back to the 20th century. He likes to drink tea and always wore black from head to toe just like his lover, Chako. His hairstyle and glasses were also very old fashioned. He thinks that the 21st century is a dirty and sad thing and he wants to bring the heart of people back into the 20th century.
- He drives a Toyota 2000GT, which was affectionally called "my soulmate".
- He is based on John Lennon, former member of the Beatles.