Machiko Fuji is the original creator of the Fushigi na Kuni no Majoko anime and the manga series The Big Adventures of Majoko. Her name is written in Japanese as 藤 真知子.

Fuji is credited as the original creator for the OVA (Original Video Animation) series Fushigi na Kuni no Majoko, which was released in three episodes starting in 1990. This anime tells the story of a young witch named Majoko who lives in a magical world and dreams of becoming the best witch ever. The plot follows her friendship with a human girl named Nono, as they embark on various fantasy adventures together.

The manga series The Big Adventures of Majoko began publication in Japan with Poplar Publishing Co. in Tokyo starting from 2004. The series was later translated into English and published in North America by Udon Entertainment as a graphic novel series for children ages seven and older, with the first volume released in 2009.

For the manga series, Fuji is credited with the original work and supervision, while Mieko Yuchi is responsible for the original illustrations and Tomomi Mizuna serves as the manga artist. The story follows a girl named Nana who discovers a mysterious diary in her room that becomes a portal to the Land of Magic. There she meets Majoko, a little witch, and the two become friends as Nana gets pulled into Majoko's big adventures.

The themes across Fuji's works center on friendship between human girls and magical beings, the exploration of fantasy worlds, and lighthearted adventures suitable for young readers. The stories are episodic in nature, with each installment presenting new magical lands to visit and challenges to overcome, often involving sweets, holidays, and fantastical creatures.