Hiro is a powerful black tender engine from Japan who was restored after being lost many years ago.
Hiro was built in Japan before being sent to Sodor in The Fat Controller's early days. He was known as the "Master of the Railway", until he was forgotten and lost in the forest.
Many, many years later he was rediscovered by accident by Thomas, who tried to restore him.
Hiro was sent by The Fat Controller to warn the engines in Vicarstown and other places along the line about the forthcoming and disastrous tornado.
Hiro was sent to the Logging Company after Henry was due to leave.
Hiro is gentle, kind, and lively engine always willing to help a friend, as justified by his helping attitude during the forthcoming tornado.
- Season 1: Snow Blind (remastered version; cameo), Shepherd's Pie (cameo)
- Season 2: Serendipity (cameo), Scot-free (cameo), Mavis and the Tornado, Rosie (cameo), Waterworks (cameo), Rock-Star (cameo), Tag-Team (cameo), Henry and Kurt, Swashbuckler (cameo)
- Season 3: Logan Leaves his Mark (cameo), Culdee Fell (cameo), The Suggestion Box (does not speak), Ice Breaker (cameo), Percy and Asbestos (cameo)