Akiyoshi Hongou

あきよし 本郷

He's credited on all relevant media as the creator of the original concept and character designs for the virtual pet franchise, Digimon. However, nothing is known about Hongo as an individual.

Probably Akiyoshi Hongo is a pseudonym for two people: Aki Maita, the creator of the original Tamagotchi, and Takeichi Hongo, the principal officer of Tamagotchi for Bandai.

[via Digimon Wikia]