Ken

Ken 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. Ken despises the 21st century: he wants to live in the 20th century forever, and he intends to drag the whole world with him.

(Source: Crayon Shin-chan Wikia)