In 1982, Taizo solved the "Dig Dug incident" caused by Pookas and Fygars, and some time later the problem in the tropical islands that happened in Dig Dug II, afterwards, he was treated as a hero. At one point of his life, Taizo was married with Masuyo Tobi, but they separated for unknown reasons. They had three sons: Susumu Hori, Ataru Hori, and Taiyo Tobi. Taizo is the chairman of the Driller Council.
In Taizo's appearances in the Mr. Driller games as a playable character, he can drill at high speed, but his air gauge decreases fast.
In Dig Dug: Digging Strike, Taizo is jealous of Susumu receiving all the attention as he was the first Driller. When he received a call from Horinesia to ask for help from Susumu, Taizo said he could help with it, but as the person never heard of him and insisted to talk with Susumu, he got angry and decided to do the job himself.
Taizo appears as a Solo Unit.