Kōichi Sakaguchi (坂口候一, born on February 10th, 1968) is a Japanese voice actor who provides voices for the Japanese version of Thomas & Friends.
Before joining, he was well known for his various roles from "Pokémon". Other roles include Dinko from "Pet Alien", Raimon Souichirou and Nikaidou Shuugo from "Inazuma Eleven", Prince Hata from "Gintama", and Cid from the "Final Fantasy" series.
- Toby (Misty Island Rescue only)
- Lord Callan (nineteenth season onwards)
- The Dock Manager (eighteenth season)
- The Grumpy Passenger (Duncan and the Grumpy Passenger and Reds vs. Blues)
- Some Sodor United Football Players (Reds vs. Blues)
- Sailor John
- He, along with Kunihiro Kawamoto and Tsutomu Densaka voiced characters from "Pet Alien".
- Both he and Noé Velázquez voiced Dinko from "Pet Alien" in their respective languages.
- Both he and Kiyonobu Suzuki voiced Gengar from "Pokémon".
- Both he and Gadi Levy, who also voices Victor and Ferdinand, voiced Raoul Contesta from "Pokémon" in their respective languages.