Kouji Segawa is the protagonist of the 1994 tokusatsu movie 'Kamen Rider J,' part of the Kamen Rider franchise. As Kamen Rider J, Kouji is a journalist and environmentalist who is transformed into a powerful hero by the Earth Spirits to protect humanity from the alien Fog Mother. He is known for his strong sense of justice, compassion for nature, and determination to defend the Earth. His iconic ability is to grow to gigantic proportions to battle kaiju-sized threats.