Ataru Hori (ホリ・アタル Hori Ataru?) is a character from the Mr. Driller series. He is the son of Taizo Hori and Masuyo Tobi and the older brother of Susumu Hori and Taiyo Tobi. Due to Taizo performing poorly as a father, Ataru had a bad relationship with him and he decided to leave home. His whereabouts were unknown until his reappearance, working as a Driller without a license from the Driller Council. Despite this, he is an ace Driller, his skills rivaling Susumu. He has a cool and collected personality and prefers to work alone, but he has a black rabbit as a pet.
Ataru is a playable character in Mr. Driller G, where his air goes down faster than Susumu, but his movement is also faster. In Dig Dug: Digging Strike he appears as Taizo's rival in the multiplayer mode.