A bug enthusiast, Ento is disciplined in the art of tracking, finding and observing wild Bug Pokémon. He travelled to Urobos chasing rumors of a legendary Bug Pokémon, eventually encountering a Basilect in a glorious and honorable battle. Having been chasing the Bug Pokémon for so long, the samurai suddenly felt aimless and empty at the journey's end. He drifted throughout the region, helping people and earning the respect of fellow trainers. Eventually he set up a Bug Sanctuary/Zen Garden in Urobos. Due to the samurai's fierce skill, trainers flocked to it on their own Pokémon journeys.
Ento's name derives from the word entomology, the study of insects.
Ento's design and concept are based on samurai. He dresses in clothing reminiscent of formal Japanese clothing worn during the Edo period referred to as kamishimo, with a broad-shouldered sleeveless jacket called a kataginu and wide-bottomed trousers called umanori hakama. His bug-catching net also has a wrapped hilt (or tsuka) and a round handguard (or tsuba) reminiscent of those on a katana.